i also have an aspire,and recently mine has been doing the same thing. i took out the fans and gave them a good clean,its only a matter of undoing a couple of screws ,but make sure you take note which way they came off,so you can replace them properly. Ive done this,and its been o.k to a certain extent ,except in a morning when i turn it on,its on for about 15Min's,then crashes.i leave it for about 5Min's and then i could leave it on all day ,no probs. its not a virus I'm sure,Ive run ad-aware,spy-bot,a.v.g you name it and its come up clear. give it a damn good clean and see how you go. but if you're in the u.k i put a bit of it down to the weather as well,that has affected a lot of services.