about maybe a week and a half ago, I downloaded iTunes 4.5. After I did this, the computer started to get really slow and freeze up a lot. Hangs also occured, and I had to force quit a great deal. However, it really wasn't that bad, even though starting up took a long time. Then, I downloaded a radio station off of the internet and things got really bad. Everything kept freezing up, especially internet explorer, iChat, and Appleworks. I couldn't even get on to Appleworks most of the time. Then one day, the whole computer froze and I shut it off. I started it back up again, only to have the computer beep at me. Then I tried starting it up again, and the blinking question mark appeared. then the next time i started it up, it finally booted up, only to be really slow and erratic. the weird thing about this is that the problems aren't consistent-sometimes the computer is messed up and sometimes it isn't. We finally did Software Restore, and although the computer seems to be slow at times, it is better than before. anyone have any clue what's going on?