All Scans Crash PC - Not Malware

Hi and thanks for reading.

I just came from the Malware forum - my helper told me the problem did not appear to be malware related and to post here.

All antivirus and antispyware scans have started shutting down my laptop. It isn't instant or related to a BSOD it just seems to shut itself down toward the end of any scan.

Things that I know crash it:
ESET nod32 antivirus
defraggler
mbam
super antispyware

These scans run just fine in safe mode.

Thank you.

 

Too late to edit.. sorry.

I should also note that when the system restarts I get a message that asks me to "Reboot and select proper Boot device or insert Boot media in selected Boot device and press a key". I have to hard reset at this point and after it boots fine (start Windows normally).