Windows 7 Toshiba performance issue

I just recently notice that the performance on my Toshiba laptop is decreasing.
The other say I decided to play minecraft and noticed it was lagging more than usual. When I tried to play on my friends server I could barely move. I've also noticed the fps drops in games like Cod4 and CSS. I've cleaned out my registry, cleared out some hard drive space, and ran gamebooster but nothing seems to work. Any help would be much appreciated.

Toshiba P755 S5320
Intel Core i3 2.20ghz
Intel HD 3000 graphics
6gb ram
640gb hdd

PS: I tried MC multiplayer on my sister's HP and it ran with no lag issues.
 
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