After having read many threads on various forums, I found that everyone is using his own manual method to remove the possibly installed Microsoft WGA notification tool. Some boot into safe mode and create empty 0Kb WgaLogon.dll file, others will use the NTFS permissions to remove the execution flag from the files (WgaLogon.dll and WgaTray.exe), others will try to remove the registry entry loading the DLL, and finally some uses all methods.

All of these methods may not be convenient for everyone, and are anyway not automated. I have created a small tool removing the WGA notification tool for you :
http://www.firewallleaktester.com/tools/RemoveWGA.exe

How it works :
RemoveWGA.exe simply checks if the WgaLogon.dll is loaded into Winlogon.exe. If so, it offers you to remove the WGA notification tool. To do so, it sets both System32\WgaLogon.dll and System32\WgaTray.exe files to be deleted by Windows at the next reboot, and add an entry to start itself. After the reboot, RemoveWGA.exe deletes all WGA notification tool traces (Winlogon registry entry, dll and exe files in system32 and system32\dllcache, and the folder located at Documents and Settings\All Users\Application Data\Windows Genuine Advantage).

Disclaimer :
I have tested RemoveWGA.exe only on one Windows XP SP2 machine.
It should be considered as BETA for now, until it has been confirmed fully working. At worst, it will tell you that it can't and that's all, you can safely test it.
To run it, you need administrator privileges to allow it to read the winlogon process.

Probably that the readers of this forum didn't even installed the WGA thing, but this tool might be usefull for someone (I hope )

(Thanks to gkweb for this one)

In addition, after the tool has removed the WGA notification, turn off your automatic update for it not to be installed again. 

Excellent find AiMizuki! Thanks a lot for that! I'm sure others are having this problem right now. I got it installed on one computer I use and it's really annoying and it says it can't get any further updates until it's resolved, and it can't be uninstalled. So when the update option showed up on the other computer I deselected it so it did not install and there's been no further notifications to install this since then.

;D thanks for the complement.. i am happy it had helped somehow..  :angel:

As i have concluded... WGA is a spyware used by microsoft to let Windows fanatics stick to their stupid market strategy...  >  :tickedoff:

http://blogs.zdnet.com/BTL/?p=3185
http://blogs.zdnet.com/Bott/?p=76

just tested on 2 machines. works perfect  O0

thanks it did...