HI
So evidently its not you're HD that was causing the pc to freeze.This looks like its a Hware problem.But try the following first.
OPen you're case and check if all fans are working. Apply some termal grease/paste to the back of you're CPU and bottom of you're Heat sink [section]
If it isnt overheating thats causing the problem than its certainly a Hware issue. Check that out first and well take from there
??
Good Luck