Does it start in safe mode (at a normal rate of speed)... if yes, have a look at this as a way to find the culprit... good luck... http://support.microsoft.com/kb/331796
reboot computer and start tapping the f8 key when you see the acer logo (spashscreen) this should put you in safe mode... type msconfig
(in the search bar & hit enter) and go from there, again good luck
Edited by Pandy, 30 January 2010 - 10:40 AM.
Moved from Windows Vista ~Pandy