Used to have pages and programs hanging up on me all the time. When I would turn the computer off I was getting 2 or 3 "Close Now?" prompts before it would turn off. And if I didn't hit the Yes button on the "Close Now?" prompt the computer wouldn't turn off.
If I didn't hang around when shutting the computer off an hour later it was still attempting to shut off.
All those problems have disappeared now. Everything seems faster and more stable now. Like a new computer.