Second Update and very functional tutorial:

1.      First – click Start then Run and type “regedit” without quotes and 
press Enter

2.      Go to My Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows 
NT\CurrentVersion\Winlogon\Notify. In this location delete the folder 
“WgaLogon” and all content with name WgaLogon. If there is no WgaLogon 
folder continue with next steps.

3.      Restart your computer. After restart WGA will not be active and you 
can remove it completely following the next steps:

4.      Set your folders options to show hidden and protected Windows 
files – go to My Computer/Tools/Folder Options and then choose View. From 
the View tab choose “Show hidden files and folders” and uncheck “Hide 
protected operating system files” and click OK

5.      Now, Go to folder Windows\System32\dllcache, find and delete 
“WgaTray.exe”. Also, check for “WgaTray.exe” in Windows\System32\, and if 
you find it delete it, and search for “Wga*.*” with Start-Search-All files 
and folders and delete everything that starts with “Wga” (Wgatray.exe; 
Wgalogon.dll, Wgasetup; etc..)

6.      Restart your computer again and live happy and free.

http://www.detector-pro.com/2009/03/how-to-remove-windows-xp-genuine.html

"vaidas_" <nera@ne.lt> wrote in message 
news:l6vlng$8sh$1@trimpas.omnitel.net...
> niekur nerandu, visu kiek randu reikalinga aktyvacija.
> gal galit pasidalinti linku.
> arba gal zinote kaip nulauzti aktyvacija visam laikui.
> toki zinau padeda 30 dienu 
> (http://forums.mydigitallife.info/threads/11827-How-to-remove-Windows-Product-Activation)
>