I did a virus scan in safe mode and removed a couple of nasties but now I'm having problems booting Windows 7. I then system restored which it said was ssuccessful but I'm in a boot loop. It will boot to the swirling "welcome" then it says "logging off shutting down". I have tried F8 start up repair but that just made it blue screen when I got to the desktop. What's the best method to get it out this boot loop/blue screen and boot up correctly ?