Why does my laptop keep shutting off?
Every time I turn my laptop on it waits about 5 minutes and then shuts off.
Is your laptop hotter than usual? It might be overheating and turning itself off. Otherwise, possibly the virus scenario.
Probably a virus. Get it backed up then restored if you want to be 100% clean.
It could be overheating, it could be set up to turn off after that time.
Check the settings in "My Computer" the power options tell the computer when to go to sleep or when to shut down.