Norton let a virus through. I ran a scan in safe mode, and found some viruses, but my CPU usage was still unusually high. I ran Malwarebytes in safe mode, and found something, but my PC BSOD'd before it could be removed. It then rebooted, and regular Windows would not start. When it eventually started, it reported that it had shut down, error code 0xf4. Also, in safe mode, while loading it showed it was loading 'NISx64'. I guess this is Norton, so could the BSOD be caused my multiple AV programs running at the same time? I downloaded Super Anti Spyware. This also found a virus, but then BSOD'd. Windows then persisted to not function, so I ran multiple recovery discs, none of which worked, for example Kaspersky reported that the security database was corrupt. Is there a way to get rid of the infection without formatting the system?