Download WGA_1991.rar
Extract WGA_1991.rar, and then run the WGA_v1.9.9.1_crack.exe self-installer inside the archive as administrator and LegitCheckControl.dll, WgaLogon.dll and WgaTray.exe will be automatically patched.
For user who prefer previous style of using a batch script to install the WGA crack so that all process is transparent and need not worry of virus or Trojan, download the following RAR archive.
Download Windows.Genuine.Advantage.Validation.v1.9.9.1.CRACKED.rar
Run the installer.bat to patch the system with WGA crack. Alternatively, run installer.bat /u to uninstall and remove the crack, or installer.bat /c to cleanup the crack after installation. All commands have to be issued in command prompt with administrative privileges.
Note: For anybody who wants to upgrade to latest WGA Validation v1.9.9.1, the LegitCheckControl.dll can be download from http://download.microsoft.com/download/C/0/C/C0CBBA88-A6F2-48D9-9B0E-1719D1177202/LegitCheckControl.cab.