Hey there - I have a 2008 aluminum MacBook (NOT the Pro) that I mistakenly upgraded to Mountain Lion (10.8.2) a few weeks ago. Ever since, it's super slow and laggy, and has been running really hot. I have smcFanControl and iStatPro, which both tell me my computer runs around 160F/73C constantly, and the fans never drop lower than 6000RPM. I have roughly 35GB of free space on my hard drive. I keep my Mac propped up on some books, and I even have a fan on it right now, and it's still hot. All I really do is internet and word processing, as I'm trying to finish my History major. Can anyone think of a reason it would be so hot? Or ridiculously slow, for that matter. Any help is greatly appreciated. Thanks!