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Change Your MAC Address in Windows

Change Your MAC Address in Windows
Đổi địa chỉ MAC trong Windows

Địa chỉ MAC là chuỗi 12-digit mà các wireless routers và các thiết bị mạng khác dùng để ngăn chặn hoặc mở truy nhập cho 1 máy tính. Đôi khi chúng cũng là 1 vết "xương" lớn. Nếu bạn đang chạy Windows, Online Tech Tips blog có 1 step-by-step tutorial hướng dẫn "đánh lừa - spoof" địa chỉ của bạn thành cái gì đó mà bạn có thể nhớ, hoặc truy nhập vào wireless network nào đó đã khóa. Bài viết dành cho Windows XP nhưng tương tự cho Windows Vista.

MAC addresses are the 12-digit strings that wireless routers and other network devices use to restrict or open up access to a computer. They're also a huge pain in the butt sometimes, requiring pen-and-paper maneuvers and frustrating connection attempts. If you're running a Windows system, the Online Tech Tips blog has a step-by-step tutorial on "spoofing" your address to something you can remember, or for hooking into a wireless network that's locked down. The guide is written for Windows XP, but the steps look much the same as they would in Vista.

http://www.online-tech-tips.com/computer-tips/how-to-change-mac-address/

Every network interface card (NIC) has a unique MAC Address (Media Access Control address). This applies to all types of network cards, including Ethernet cards and WiFi cards. The MAC Address is a six-byte number or 12-digit hexadecimal number number that is used to uniquely identify a host on an Ethernet network.

An example of a MAC address is 1F-2E-3D-4C-5B-6A and it falls into the Layer 2 networking protocol of the OSI model. In today’s networks, a MAC address is converted to a Layer 3 protocol address, such as an IP address, by ARP, or Address Resolution Protocol. Read my post on how to find your MAC address if you don’t know it.

All MAC Addresses are hard-coded into a network card and can never be changed. However, you can change or spoof the MAC address in the operating system itself using a few simple tricks.

So why would you want to change your MAC address? Well there are many reasons for this, mostly related to bypassing some kind of MAC Address filter set on a router or firewall. Changing the MAC Address can help to get you past some type of network restriction by emulating an unrestricted MAC Address or to get access by spoofing a MAC address that is already authorized.

For example, a WiFi network may allow only authorized computers to connect to the network and filters based on MAC address. If you can sniff out a legitimate MAC Address, you can then spoof your MAC address and gain access to the WiFi network.

Another example is if you have an ISP that allows only a certain number of computers to connect to the Internet from your home. If you have more computers that need to connect, you can spoof the MAC address of an authorized computer and connect from a different computer.

You can change the MAC Address on your network card pretty easily following the steps below:

Step 1: Click on Start, then Control Panel, then Network Connections, and right-click on the network connection you want to change the MAC address for and select Properties. It will normally either be Local Area Connection or Wireless Network Connection.

If you are using Windows Vista, you have to go to Control Panel, then Network and Internet, then Network and Sharing Center, and then Manage Network Connections.

Step 2: On the General tab, click the Configure button

Step 3: Now click on the Advanced tab and click on the “Locally Administered Address” property or the “Network Address” property.

By default, the “Not Present” value is selected. Go ahead and click on the Value radio button and enter in a new MAC address. The MAC address is a combination of 6 pairs of numbers and characters, i.e. 40-A2-D9-82-9F-F2. You should enter the MAC address without the dashes.

You can check that the MAC address has been changed by going to the command prompt and typing in IPCONFIG /ALL. Go ahead and restart the computer in order for the changes to take effect.

This is the simplest way to change your MAC address in Windows. You can also do so via the registry, but it’s much more technical and probably not required by most people.

How To Block Websites Without Software!

How To Block Websites Without Software!
Chặn các Websites không cần phần mềm!

Hướng dẫn:
1] Mở theo đường dẫn C:\WINDOWS\system32\drivers\...
2] Tìm file có tên là "HOSTS"
3] Mở nó lên bằng notepad
4] Ở dưới "127.0.0.1 localhost" thêm vào 127.0.0.2 www.sitenameyouwantblocked.com , khi đó site này sẽ không thể truy nhập được nữa !!!
5] Kết thúc!

-So-

127.0.0.1 localhost
127.0.0.2 www.blockedsite.com
-->www.blockedsite.com is now unaccessable<--

Cho mỗi site sau đó muốn thêm vào, thêm "1" cho số cuối trong dãy IP (vd 127.0.0.2).

IE: 127.0.0.3 www.blablabla.com
127.0.0.4 www.blablabla.com
127.0.0.5 www.blablabla.com

Chúc thành công và đừng dùng với mục đích phá rối !!!

Disable Autorun in Vista to Protect Against Malware Infections

Tất cả các phiên bản Windows hiện nay có tính năng được gọi là AutoPlay và AutoRun. AutoPlay cho phép bạn chọn chương trình nào được dùng cho các ứng dụng media, như là các CD/VCD/DVD chứa nhạc, video, phim, hoặc là hình ảnh. Lấy ví dụ, lần đầu tiên bạn nghe nhạc từ đĩa CD, nếu bạn có nhiều hơn 1 chương trình media player trên máy tính, AutoPlay sẽ hỏi bạn muốn dùng chương trình media player nào. Bạn có thể thay đổi "AutoPlay settings - Thiết lập Autoplay" cho mỗi loại media.

Autorun là cách để chạy nhiều chương trình hoặc nội dung nổi bậc (như là video trên đĩa CD nhạc) một cách tự động khi bạn bỏ đĩa CD hoặc cắm ổ USB vào máy tính. Khác với AutoPlay ở điểm này, nhưng kết quả là giống nhau, khi được đưa vào, đĩa CD hoặc ổ USB tự động bắt đầu dùng một chương trình nào đó để chạy ứng dụng. Autorun kết hợp chặt chẽ với loại media mà nó dùng và bạn không thể điều chỉnh nó.

Khi một đĩa được bỏ vào hoặc một ổ đĩa được kết nối với máy tính, Windows tìm file có tên là autorun.inf trong thư mục gốc - root directory của đĩa đó. Nếu tìm thấy, Windows thực thi theo hướng dẫn trong file đó mà không cần biết đó là gì (có thể là nhạc và cũng có thể là virus)!!!

Lấy ví dụ, một file autorun.inf trên một CD có thể gồm một dòng là "open=setup.exe". Có nghĩa là máy tính sẽ chạy một cài đặt ngay khi đĩa CD đó được bỏ vào.

Bây giờ tôi biết bạn đang nghĩ là tại sao không disable nó trong Control Panel.

và bạn có thể làm như thế. Nhưng ngay khi mở ổ đĩa từ from My computer hoặc Windows Explorer, Windows sẽ vẫn cứ chạy file autorun.inf !!!

Bạn có thể cũng tin là có thể tự bảo vệ đối với AutoRun bằng cách sửa lại 2 keys trong Registry là NoDriveAutoRun and NoDriveTypeAutoRun, but it has been shown that these keys can be overridden by a little-known registry key called MountPoints2 which contains cached information about every memory stick or other removable device that your PC has ever seen, and that overrides the NoDriveTypeAutoRun value if you insert a device which the PC already knows about.

The solution to this problem is to globally block autorun.inf files from executing without using the dialog boxes in Vista to do this. Here’s how:

1. Start Notepad or any text editor.
2. Copy the text below into the text editor, [everything between the square brackets should be all on one line]REGEDIT4
   [HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsNTCurrentVersionIniFileMappingAutorun.inf]
   @=”@SYS:DoesNotExist”
3. Save it to your desktop as NoAutoRun.reg. Make sure the extension is .reg and not .txt.
4. Right-click your new .reg file and choose Merge.
5. If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
6. Click Yes when you’re asked “Are you sure you want to add the information in C:NoAutoRun.reg to the registry?

Now the next time you insert a flash drive, CD, DVD, or other removable disc into your system, Windows will not execute the information in any autorun.inf file that may be present. The downside of this is that when you insert a CD or DVD with software on it, you have to find the setup program using My Computer or Windows Explorer and launch it yourself. But I think that’s a small price to pay for the increased security.

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Gỡ bỏ phần mềm - How to Uninstall a Program

Làm thế nào để gỡ bỏ phần mềm Norton?

Bạn cần Product Key khi cài đặt lại phần mềm Norton. Hãy làm theo các bước trong hướng dẫn để sao lưu lại Product Key vì biết đâu sau này bạn lại cần nó. Mỗi phần mềm có hướng dẫn khác nhau, hãy lựa chọn đúng trước khi thực hiện.

• Phần mềm Norton được mua từ nhà cung cấp dịch vụ của bạn
• Norton 360
• Phần mềm Norton 2009
• Norton SystemWorks 12.0
• Phần mềm Norton 2008
• Phần mềm Norton 2007
• Phần mềm Norton 2006
• Phần mềm Norton 2005 hoặc 2004
• Phần mềm Norton 2003
• Norton Ghost hoặc Norton Save & Restore
• pcAnywhere hoặc WinFax
  

Disable/Turn Off User Account (Access) Control (UAC) in Windows Vista

Source: http://www.tipandtrick.net/2008/ways-to-disable-or-turn-off-user-account-access-control-uac-in-windows-vista/
http://www.pcdoctor-guide.com/wordpress/?p=4641

Ways to Disable or Turn Off User Account (Access) Control (UAC) in Windows Vista

User Account Control (UAC), or unknowingly mistaken as User Access Control is new security feature in Windows Vista. The main display of UAC is the occasional pop up dialog box asking for user’s permission needed by Windows or for user to enter administrator’s password to perform the operation or run a program especially setup executable, installer or system tools. UAC also affects command prompt (Cmd.exe) with errors such as “The requested operation requires elevation” or “Access Denied” when not running in elevated command prompt with full privileges.

The annoying symptom happens because User Account (Access) Control or UAC forces all processes to run in lower elevation mode with limited privileges. When a program or process requires access to system files, folders or registry hives that only administrator can access, UAC launch a consent prompt to allow user to give approval or enter administrator’s credential to higher elevation with full administrator’s rights.

For user who find the constant UAC elevation approval request annoying, and confident that you can maintain the security of computer from infection without the help of UAC, it’s possible to turn off and disable UAC. Turning User Account Control off potentially fix compatibility issue where UAC prevents some programs, applications, components, processes or games from running properly even if authorization is given to elevate its privileges, as delay in execution as may break certain real-time functions.

There are a few ways that you can use to turn off the UAC, but most home and personal users should find method to disable UAC via Control Panel easiest to do. User Account Access Control, when turned off and disabled., will affect all users on the computer.

Method 1 - Turn Off UAC via Users Accounts Control Panel

1. Click Start and then open Control Panel.
2. In the Control Panel, click User Accounts and Family Safety.

   

3. Click User Accounts.

   

4. Click Turn User Account Control on or off.

   

   When prompted that Windows needs your permission to continue, press Continue button or enter the administrator’s password.

5. Clear the tick or check mark on the check box beside the option to Use User Account Control (UAC) to help protect your computer.

   

6. Click OK.
7. When prompted that computer must be restarted to apply the changes, reboot the computer.
8. To enable the UAC, simply tick or select the checkbox again.

Method 2 - Disable UAC Using Registry Editor

1. Run Registry Editor by typing RegEdit in Start Search or command prompt.
2. Registry Editor, navigate to the following registry key:

   HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System

   where HKLM is HKEY_LOCAL_MACHINE.

3. Right click on EnableLUA registry subkey and choose Modify or double click on EnableLUA registry value name in the right pane to modify the setting.

   

4. On “Edit DWORD (32-bit) Value” dialog box, set the new value data as 0.

   

5. Exit from Registry Editor.
6. Restart the computer.
7. To enable the UAC again, simply change back the value data of EnableLUA to 1.

Method 3 - Turn Off UAC Using MSConfig System Configuration Utility

• Type MSConfig in Start Search box or Run command (open by pressing Win+R) and hit Enter key.

  When prompted that Windows needs your permission to continue, press Continue button or enter the administrator’s password.

• In System Configuration window, click on the Tools tab.
• Scroll down and locate to select Disable UAP or Disable UAC option in the item list.

  

• Click the Launch button.
• A command prompt window will open and automatically execute and run scripted process to disable UAC.
• On completion, The operation completed successfully message will be shown. Close Cmd.exe window when done, and then exit form MSConfig.
• Restart computer for changes to apply and become effective.
• To return UAC to on status, simply select Enable UAP or Enable UAC, and then click on Launch button.

Method 4 - Disable UAC Using Group Policy (Active Directory GPO or Local Group Policy)

Note: Windows Vista Home Premium and Home Basic editions do not have Local Group Policy Editor.

1. Click Start and then type GPEdit.msc in the Start Search box and hit Enter key to open the Group Policy Editor.

   Note: If you’re using Active Directory Domain GPO which controls many computers, open Group Policy Management Console by click on Start, and then type GPMC.msc in the Start Search and hit Enter key from a Windows Vista computer that is a member of the AD domain. In the Group Policy Management Console (GPMC) window, browse to the respective GPO which is linked and enabled to the OU (organization unit) or domain where the Vista computers are located, then edit it.

2. Navigate and browse to Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options.
3. In the right details pane, there are a few User Account Control related policies. Right click each of the following policies and configure or change the value to the new value indicated below after the dash (-):
   • User Account Control: Behavior of the elevation prompt for administrators - Elevate without prompting
   • User Account Control: Detect application installations and prompt for elevation - Disabled
   • User Account Control: Run all administrators in Admin Approval Mode - Disabled

   

4. Restart the computer to make the changes effective.
5. To re-turn on UAC, revert back to original values of the policies, which is Enabled and Prompt for Consent.

Method 5 - Disable User Access Control from Command Prompt

1. Open an elevated command prompt.
2. Run the following command to disable and turn off UAC:

   C:\Windows\System32\cmd.exe /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f

3. To re-enable and turn back on the User Account Control, run the following command:

   C:\Windows\System32\cmd.exe /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 1 /f

4. Reboot the computer for the changes to take effect.

Note: After disabling and turning off UAC, a red X shield icon of Windows Security Center will be displayed in the notification area (system tray). My Digital Life has the guide to remove the Windows Security Center warning icon and messages.

Related Articles

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• Permanently Turn Off and Disable 64-bit (x64) Windows Vista Forced Driver Signature Signing with ReadyDriver Plus
• How to Disable Windows Vista CD/DVD Disc Burning/Recording Function
• How to Disable Windows Vista CD or DVD Drive Auto Eject or Open Feature
• Error 1721: There Is A Problem With This Windows Installer Package When Install or Uninstall on Vista
• Windows Server 2008 or Vista Activation Fails When Configure Third Party Firewall to Use HTTPS Authentication to Access Internet
• Bypass or Disable UAC for Selected Excluded Programs Only with Elevator (SkipUAC)
• Fix Setup Installer Package Access Denied Failure Error Code 0×80070005 (Or 5 Or 0×5)
• Workaround to Run VMWare Server on Windows Vista
• How Open Command Prompt as Administrator on Elevation in Vista

Where I find out Tips and Tricks on the Internet

http://www.tipandtrick.net/2008/ways-to-disable-or-turn-off-user-account-access-control-uac-in-windows-vista/
http://www.pcdoctor-guide.com/wordpress/?p=4641
http://www.online-tech-tips.com/computer-tips/how-to-change-mac-address/