Hi. About a month ago I ran CCleaner and found about lots of different problems. I chose to fix them all. Turned off the computer. The next morning I go turn on the computer......Blue Screen of Death saying some stuff about the HKEY_BOOT registries. I tried starting comp normally again, doesnt work. Tried safe mode, no luck. Unfortunatly I didn't have the windows cds and I had to do a reformat which was rather frustrating (luckily all my important documents ect were backed up).
A word of warning to anyone who uses a program that tampers with registries - Make sure to back up everything