Microsoft Security Essentials was disabled and wouldn't turn on giving some error about it not being installed (never had it not work for me) so I was suspicious that I had a virus, I ran a MalewareBytes quick scan but it found nothing so I uninstalled MS Security Essentials and reinstalled it; ran a scan and it detected Sirefef .AA, .AB, .AN, .P and .W, During the scanning process a windows error came up saying "critical error computer will be restarted in one minute" (this happened several times) tried to abort it in cmd to no avail. I selected remove on the list of viruses and MS Security Ess. gave me the option to restart to finish the removal which this time I did before the auto shutdown. Judging by what I have been reading I probably still have the virus.. what should I do? Your advice would be very appreciated.