Earlier in March I downloaded the free trial System Mechanic. Almost immediately after running a "deep clean" I started experiencing strange behavior. In particular I'd have to hit the refresh button 2-3 times to get a program such as a bank login page to completely populate. Ultimately my system froze, ctrl-alt-del was unresponsive. The only recourse was to reboot. But that hardly helped. My computer would freeze within 2-3 minutes of the reboot. Ultimately I had to have the disk wiped and my OS reinstalled. That cost me plenty both in terms of time and money!