Compaq Presario CQ-40 HDD Problem

Did you run a virus/spyware scan? If yes and it's clean, try creating a new account and see if that works faster. If it does, you can use that one as your main account. Just copy over the files to it, Favorites, My Documents, Desktop are the main ones you want.

And uhh everytime i play Source Engine game it would freeeze after 1min

Desktop are the main ones you want.