Did a search and not finding quite the same problem elsewhere, hoping I can get some help. I am running a dual-boot system with Win XP and Win 8.1, each one being on a separate hard drive. For the last few days when I've been running Windows 8 the computer will just shut down randomly with no warning. Have been running McAfee as my main anti-virus and doing scans with Super Anti-Spyware and neither gave any virus warnings before this started happening. I did a scan with Malware Bytes of the hard drive while running the other drive (Win XP) and it found a few PUPs, can attach the log from that if it helps. Would anyone be able to give me some ideas if they think this more likely a virus issue, or possibly a hardware issue with Win 8? After running Malware Bytes and removing the threats it found I attempted to restart in Win 8 and do a virus scan and it would not stay powered on long enough to get through it.