I have been working on a friend's laptop, one which I have 95% recovered from a virus. I was nearly done with cleaning and I noticed the Security Center and Firewall were not active and could not be started for whatever reason. Neither are present in Services so I downloaded Microsoft Security Essentials to see if it could sort it out (SFC scan doesn't work either) and now I have a new problem... MSE was doing a quick scan and I got a popup "the system has encountered a serious error and you will be logged off" or something along those lines. Now the computer automatically restarts over and over because this keeps popping up each time I log on (even in Safe Mode!); I can't do anything because I get maybe 2 minutes of time after logging on and it will restart on its own. This has me extremely frustrated because the computer was nearly done and now I have to deal with this crap. How do I fix this without restoring the computer to a previous date?