I originally thought this was a rootkit virus problem and started a thread over on virus and malware removal here vb/topic170990.html (sorry i couldn't link it my current post count is 4) but everything showed up clean. Problems with my pc were first evident when I started getting random restarts and system hangs but since the fan problem has developed I don't seem be getting these symptoms anymore. The issue with the fan just happened on bootup one morning, the computer sounds like its going to take off and cpu-hw is telling me my fan speed is 4400 rpm. after Checking fan wiring and cleaning dust out of my case with no result I decided to reset my bios. This solved the problem of fan speed and I continued to use the computer normall for a couple of hours with no issues. I then turned it off and when I booted it again the next day the fan issue had returned and has remained since. specs: Acer eg43m mother board with ami bios p01-a2 intel core 2 quad q8300 2.5Ghz ati radeon hd 5750 windows 7x64 home premium 2 x gb ddr3 ram 500w casecom psu other information: I have reinstalled windows since the problem started (not to try and fix the problem but because I wasnt able to activate my previous install).