Hey all, I'm working on my brother-in-law's computer. He's got an old dual core iMac and he had to replace his old keyboard with one of the new ultrathin keyboards. The problem is that now, Windows doesn't pick up his mouse when it's plugged into the keyboard. Is this some sort of driver issue? It's been so long since I screwed around with windows that I don't know how to even begin. Thoughts?