Last night while using my computer, out of no where the program I was using started acting funny and lagging. I quit AOL Instant Messenger and tried to open it up again. It seemed like everything was fine but before I could sign back in a box popped up saying "the application has unexpectantly quit". I tried opening Internet Explorer, and again got the 'unexpectantly quit' pop up. Every other program I tried opening did the same thing except iTunes was working fine. I logged out/in of my account but it didn't work. I restarted my computer multiple times and it still doesn't work. At the moment, iTunes is the only program that is opening on my computer. Please help me as soon as possible!