Thanks for your replies...

I'm thinking it has to be something with the computer itself... here
is some more info that I couldn't post before because I had to get to
a meeting....

I work for a large company and we have a couple thousand of these
systems out there. Luckely this problem isn't too widespread but is
annyoing when it pops up. All the systems are configured exactly the
same because they are all cloned off of a single Ghost image(running
WinXP Pro SP2 as the OS). The only thing I could think is that it is
some sort of bios setting(which can't be cloned) or that something is
wrong with the actual hardware of the computer... perhaps the card
isn't getting enough power. In the past I've just replaced the user's
computer, but that means longer down time for them.

I may have answered my own question(by possibly pin pointing it to the
hardware) but thought I'd throw this question out there for any other
possible idea's... plus this could prove potentially useful to someone
else as I wasn't able to find a whole lot in searching the web myself.