My computer shuts down while I'm on-line?

I just bought this computer 21/2 months ago window vista Intel core 2 duo Acer. While I'm on-line at any lengh of time it just shuts down. I wait about 5 min. turn it on and everything starts fine. It has done this 5x I do have a repair plan where I bought it.

My computer shuts down while I'm on-line?photoshop

I'd suggest running spyware and virus scans then making sure that Vista is fully updated, check your problems and solutions in control panel it could be a driver or software issue that's easily fixed with a simple download. If all else fails put your repair plan to use.

My computer shuts down while I'm on-line?symatec

i had the same and sent the computer back 3 times and had 3 new ones think it is vista not your pc still does it now on my new pc