Is anyone seriously debating drivers or the OS preventing the fan from running? 99.9999999999999% of the time when a fan stops running it’s due to a blockage, motor short, or a bad bearing (the most likely of the three). Does the fan spin completely freely when you turn it with your finger, or does it feel “bumpy?” Does it start spinning when you tap it?
My gaming PC is a relative old clunker:
3.2 GHz P4
3 GB RAM
Nvidia GeForce 8600GT, slightly overclocked
It runs games at least as well or better on Windows 7 (and Vista Ultimate before that) than it did with XP. I play Bioshock, Half-Life 2 (ep1 and ep2), CS:S, Company of Heroes, ARMA, and Left 4 Dead 2 on that machine, and have taxed it with Crysis and Flight Sim X. Yeah, there’s a lot of stuff out there my machine can’t run, but any performance problems are definitely not due to Windows 7 itself.