Hello
I had the same message on my computer, my copy of xp was supplied with the pc, after updating windows i then got a bubble saying i may be using a non genuine copy of windows.
I followed the instructions to rid myself of this message & can you guess microsofts responce "get in touch with the pc manufacturer" very helpfull [ not ].
Well anyway the message has now gone away of its own accord, but the other thing is that my display went funny when the message was displayed on the front page of starting up when you input your passport a large round circle appeared & once logged in there was a green tinge around the picture ( my wallpaper ) this might just be coincidence, or???
Regards Kas