If you're still using your work computer I'd wait and try it at home. You usually can do a little more with your own computer than you can with your employers. Follow the instructions in the first link I posted when you get back to your PC, if that doesn't work then I'd say suck it up and go to the store because if that can't fix it then it's probably more complicated then I'm capable of dealing with (And I'm assuming you as well, no offense intended of course.)
Sorry I couldn't be more helpful, I tried
