It freezes... when? A little more detail on the freeze ups would help. Often problems like that will turn out to driver related(video or sound card). New system, old system? On an older system wear and dust buildup will see temps climb where hardware problems can be realized.
A bad dimm of memory, a failing expansion card, read/writes heads on a hard drive, weak battery on the board itself, etc. are common hardware related issues. Some general system information would also be helpful.