I have win 7 home premium 64bit with CTM 2.8. I use a USB flash for important files( they are about 1$ per Gig nowadays.) I have experimented the heck out of my coputer, beta testing anti virus from different makers, beta testing browsers, malware games. CTM saves me sooo many times.
The only frieghtning thing about it is when you are uninstalling LET IT FINISH. This is when the unbootable pc troubles were reported.
CTM 2.9 was a bad experience for me. Taking a 3 min process to an 1 hour one is a HUGE downgrade. I heard it uses linux on a seperate sector. The report on it was that it was better at driver state maintaining. I had a blinking and slow to move mouse during everyday use with 2.9 though it was not doing anything. Maybe the maintaining was overloading the CPU, I didn't like the added benifit at that cost. Or I had other malware and CTM took the blame. But the slow reinstalls is all 2.9. CTM 2.8 quick reinstalls and no blinking mouse.