Windows XP Home Edition SP 2

Archived from groups: microsoft.public.windowsxp.security_admin (More info?)

Almost a year ago I downloaded the SP2 to my pc direct from microsoft
website. For the most part my pc & my XP Home Edition works fine except that
what ever screen or webpage or email or anything I'm doing the the screen
that I'm on tends to de-highlight. I'm not sure if that's the right way to
discribe it. I have to keep clicking the mouse some where on the screen I'm
working on to make it the again the main screen I'm on. I hope someone
understands what I'm trying to explain. It is very fustrating.
I would appreciate any help.