I found a great utility program that allows you to tweak the clock speed little by little, I have the same setup and got mine to 2.2 w/ stability...
http://www.cpuid.com/clockgen.php
Hope I am not repeating a post but I am operating an Aspire 5100-3825 w/ Vista Home Premium and have a problem with DVD playback.
My drive is a MATSHITA DVD-RAM UJ-850S ATA. An error message reading: Windows Media Player cannot play...