Applications :: ITunes 10 Or 9 Won't Launch On 10.6?

This is weird. A few days ago iTunes 10 started causing my computer to go crazy every time I launched it (didn't realize it was iTunes at this point causing the problems). The computer would slow to a snail's pace and eventually completely freeze. Then a day or so later iTunes stopped launching all together. It bounces in the dock, stops and then has to be force quit. Most disturbingly after one of these unsuccessful launches, when I try to shut down, the computer hangs and basically freezes requiring a hard shut down with the power button. A few reinstallations later, no change