i used some prior version and they were horrible plus they didnt support XP or 2k (dont know if 3.0 one does). it takes constant "images" of ur hard drives and u also need to allocate a lotta space on them too if u wanna monitor anything for an extended period of time. if u have WinXP i would suggest u stick to the Rollback feature. i personally use Driveimage and take periodic images