I have this problem with my laptop.
Whenever I run an application like anti-virus software it shuts down automatically after a few minutes of scanning.
I don’t know if it’s a virus that made this.
I’m not good at this kind of stuff (about computer troubleshooting).
Just to make sure I understand correctly, does this occur only with anti-malware and security software or with any (and all) applications you try to run?
Most probably you’re infected… or your computer is turning off due to overheating…
I suggest:
Clean your temporary files.
Schedule a boot time scanning with avast with archive scanning turned on. If avast does not detect it, you can try DrWeb CureIT! instead.
Use SUPERantispyware, MBAM or Spyware Terminator to scan for spywares and trojans. If any infection is detected, better and safer is send the file to Quarantine than to simple delete them.
You might be running 2 antiviruses or you might have an anti-malware/spyware that is running in background.
If uninstalling the second anti-virus/malware doesn’t fix it then, it could probably be a virus or your computer might be incapable of running the anti-virus. No offense but, laptops are not as powerful as desktop comps. Even me, I have lot of problems here in my laptop.
Hope it helps.