It sounds like a bum part (but which) if you can let it cool off.
My computer is freezing up almost everyday.
I get a message that says system windows 32 error no disc. After I ctrl-alt-delete several times or reboot several times I get the black screen. Some times I have to shut it down and leave several hours. That don't always work . Then out of the blue it will take off working. I have restored to previous dates and that helps some times. I have a windows XP. I just bought it in January 2006.
I have the AVG antivirus and antispyware. It is updated 2 times a week and scanned.
Thanks for any help