My PC crashes all the time. It didn't when I first bought it and the bloke I bought it off said he wouldn't sell me a computer that crashes and challenged me to crash it. I couldn't.
But know, a year after buying it, it crashes at least once a day. I am not doing anything but using various programs and the internet.
I know people whos computers very rarely crash. I wish I knew their secret!
Windows2000 is supposed to be a huge improvement.