How To Change Your Windows XP Serial Key

Method 1:

Note Microsoft recommends that you run System Restore to create a new restore point before you follow these steps. For information about how to create a restore point by using System Restore, see the "To Create a Restore Point" help topic in Help and Support.

1.	Click Start, and then click Run.
2.	In the Open box, type regedit, and then click OK.
3.	In the left pane, locate and then click the following registry key: HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents
4.	In the right pane, right-click OOBETimer, and then click Modify.
5.	Change at least one digit of this value to deactivate Windows.
6.	Click Start, and then click Run.
7.	In the Open box, type the following command, and then click OK. %systemroot%\system32\oobe\msoobe.exe /a
8.	Click Yes, I want to telephone a customer service representative to activate Windows, and then click Next.
9.	Click Change Product key.
10.	Type the new product key in the New key boxes, and then click Update. If you are returned to the previous window, click Remind me later, and then restart the computer.
11.	Repeat steps 6 and 7 to verify that Windows is activated. You receive the following message: Windows is already activated. Click OK to exit.
12.	Click OK.
13.	Install Windows XP SP1 or a later version of Windows XP. If you cannot restart Windows after you install Windows XP SP1 or a later version of Windows XP, press F8 when you restart the computer, select Last Known Good Configuration, and then repeat this procedure.

Method 2:

Download the following file from here. Just select your OS (Vista or XP), agree to the terms and hit download.

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Remove AVG 8.5 Notifications on The Free Edition

Follow the instructions exactly and you should not have any issues.

1. Open Notepad or another plain text editor.

2. Copy and paste the following three lines from this page into the text editor:
@echo off
ren avgmwdef_us.mht avgmwdef_us.mht.bak
ren avgresf.dll avgresf.dll.bak
ren avgfree_us.mht avgfree_us.mht.bak

3. Save the text document containing the above three lines in the location where AVG 8 is installed. By default, this will be C:\Program Files\AVG\AVG8. Save the file as something like “AVGNotifyOff.bat”, without the quotes. It really doesn’t matter how you name the file, so long as you can identify it, and it ends in the “.bat” extension, so Windows sees it as a batch file.

4. Once the file’s saved, close the text editor, navigate in Windows Explorer or My Computer to C:\Program Files\AVG\AVG8, locate the batch file document you saved in step 3 above, and you should be able to run the file by pressing and releasing the Enter key. All the batch file does is rename two files with a “.bak” (backup) extension, so the files are still there, it’s just that AVG can’t see them any more, and you should find that the bottom line of the AVG user interface window no longer displays the “Hide notification, button” item.