BEWARE: Some  users (including me) have experienced catastrophic disk failure when doing uninstalls of this software. I  recommend that you DO NOT use this software until it's problems are better understood and addressed.

Comodo offers a FREE system restore program that has the benefit of allowing you to do a restore even if Windows won't boot. Very helpful when your computer life has fallen apart and you need to get it back without spending hundreds on a pro. Works with XP, Vista & and some of the Server versions of Windows. Download it here.