To remove the annoying “Windows Genuine Advantage Notification” from your system you will have to remove it from Control Panel but by default it wont let you remove it that way so we have to make it available to be removed.
You will have to reboot the computer into
Safe Mode (by pressing the F8 key repeatedly after the computer boots up and before windows loads)first in order for this to work.
Follow the below steps to make it available:
Open the Search companion then search and delete WgaTray.exe file on your system drive (also check the “Search system folders”, “Search hidden files and folders” and “Search subfolders” checkboxes ), delete the registry key WgaLogon in the following tree: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ Windows NT\CurrentVersion\Winlogon\Notify\WgaLogon, and to remove the entry from Add/Remove Programs list, modify the registry key in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\ CurrentVersion\Uninstall\WgaNotify. Click on Start.
Click on Run.
Type in regedit in the Run text box.
Click OK or press Enter.
In Registry Editor, browse the the following registry key branch:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WgaNotify
On the right panel, modify the value of NoRemove (by right clicking on the key and choose Modify) to 0.
Exit the Registry Editor.
Re-launch the Add/Remove Program, and Windows Genuine Advantage Notifications (KB905474) is now removable.