So yeah, I've been having issues with running games on my PC recently--it'll run fine for a minute or two, then the framerate starts chugging and doesn't stop. Every game I've tried running that does this has previously run completely fine on my machine. The problems persist on a fresh install of Windows 7, so maybe it's hardware related? Aside from that, I'm not really sure what the problem could be.
For reference, my PC is an ASUS G72GX notebook with 6 gigs of memory, a 2.53 GHz Core 2 Duo and a GeForce GTX 260M.
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If rolling back a few drivers and clearing out the dust as best you can doesn't help, I'd contact wherever you bought it from. My Alienware's GPU ended up frying because I took too long to fix it.
While I haven't heard of it potentially cooking mobos (that'd suck), it's definitely worth stopping a fan before you clean it out just to avoid stressing and wearing out the ball-bearings on the fan.
Happened to a guy I work with, he had to replace the fried board out of pocket. Was a hard lesson to learn, but fortunately wasn't a horribly expensive board either.