file scanned then pc shuts down ?

[fender62]

i downloaded a zip file then used bitdefender to scan it before i opened it, after it scanned the pc shut down

not suddenly but went into shut down by itself. i rebooted and did a full pc scan but it did not find anything

ad-aware and s&d didnt either

[LLXX]

...overheat? Check your CPU cooling.

[nitroshift]

uncheck the box where it says "shutdown the pc after scan is complete". I'm using bitdefender internet security too. Nice piece of software, ain't it?