Here is the MS kb article on this error. This is a highly technical fix, you have to boot into safe mode (the article suggests using the admin account, but safe mode is better). If you aren't really handy with computers, you might have a windows expert look at it.
Anecdotally, some people report that this fix does not work, however, its complicated enough that it is difficult to tell if it really doesn't work or if they just did it wrong.
http://support.microsoft.com/kb/947215
Oh wow, we had the same thing happen with Windows 7, but I cannot recall at all what we did to get it to work again .... Maybe swampcritter can stop by .. he may know more than I do.
C~
You know gwen there maybe a computer group, I know there used to be one, go back to the forums page on the right it says groups click on there for a list..good luck