Windows Genuine Advantage (WGA) is an anti-piracy system created by Microsoft that enforces online validation of the licensing of several recent Microsoft Windows operating systems when accessing several services, such as Windows Update, and downloading Windows components from the Microsoft Download Center. This notification checks whether you have a genuine copy of Windows registered to your computer. WGA consists of two components: an installable component called WGA Notifications that hooks into Winlogon and validates the Windows license upon each logon and an ActiveX control that checks the validity of the Windows license when downloading certain updates from the Microsoft Download Center or Windows Update.

WGA Notifications covers Windows XP, Windows Vista and also for latest OS Windows 7. If you don't have a genuine copy of windows, you will be notify pop up in the bottom-right of your screen:

Remove Windows Genuine Advantage (WGA)

1.Restart your computer and boot into safe mode (press F8 while you restart your computer)

2.Open Windows Explorer then browse to C:\Windows\System32\

3.Search for WgaTray.exe and Delete it. If you can’t delete this file, try this method, Ctrl+Alt+Del and      

   find WgaTray.exe and end task this program and then delete WgaTray.exe immediately

4.Click Start > RUN > Regedit then go to Go          

   to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon\Notify 

   and delete the WGA LOGON folder.

5.Reboot your computer. Done

You can also use WPA Killer. What you need to do is search from Google by key word " WGA killer", find any downloadable file containing WGA killer. This is one of them provided by http://www.ziddu.com.:



Download it. Run it in your computer. Note, some file is still in compressed file, so you need to extract first before run it.