I know this is a question that can be googled but I need this explained in simple terms. I have a ASUS laptop that used to be a rocket. It has quad-core, solid state HD, 5870 ATI Graphics Card, 8GB Ram, etc. Now for some reason it just acts chocked up. I have used CCleaner and that helped and so did running a Defrag and scan. I also have most things I don't use uninstalled and all features I don't use turned off. Still it wont play a simulator it used to very easily.... Its just acts like there is something sucking up juice in the background. Anything I can check or try that you guys know of. Thanks All!