Microsoft is doing this to stop piracy & also to nag the Genuine Windows users.
It's very irritating for the Windows users to see a dialog box that says your Windows
OS is not genuine. It sometimes happens for the genuine users also!! If MS
continues with this trend, more & more Windows users will say goodbye to Windows,
and move to Linux!!
i have a copy of WinXP pro , original i.e. , and i got the first WGA update .. and pop ... it thought my copy was not valid. .... a system restore solved it .. and i added the update to the ignore list .. thats all ... no more nag ..