I am relyably informed that the following method could be used to remove the niggle.
Start in SAFE mode (F8 during bootup)
Start in safe with command prompt
Go to Windows\System32 folder and delete wgatray.exe
Use EDIT to write a blank file, and save as wgatray.exe
Set the attributes to read only sytem, hidden. This stops the dll trying to change the file you just made in place of the one the billionare wants you to run.
run regedit, and search for all wga references and delete.
Reboot to a screen with no niggles.
{If you are new to DOS type CD C: \Windows\System32}
TYPE del wgatray.exe
TYPE edit
use the menu at the top of this edit window to save the empty window as wgatray.exe
use the file menu to exit
TYPE ATTRIB +H +S +R wgatray.exe.
TYPE REGEDIT
use find to search for all references to wga and delete them
close everything down, (use ctrl, alt, del and shut down)
Reboot to no niggle screen.
Now, use Setting, Control Panel, Automatic Updates, and select the radio button for Turn Of Auto Updates.
The machine will warn you, just ignore and get on with it.