yesterday i had a lagging computer, some games i can't play of the lagg i got, graphics are the lowest and battery stands on high prestations but it was still lagging, when i closed the game my pc lagged like hell, any tips?
Depends on the power of your computer. If your computer doesn't meet the minimum specifications of a game then it won't run properly. If you computer starts lagging/being slow after you've closed a game it means that your computer is near it's maximum memory usage which means you haven't got enough RAM to run the game.
If you have got a capable computer it is completely possible that your computer is infected with a virus which is slowing the computer down dramatically. I would suggest doing a full system virus scan to see if that is the case.
To be honest,Matt is right. Mostly you might play a game which is not compatible with your pc can also increase pc's RAM Memory and your Windows explorer might not respond.. So you have to check what is the specification of the game that can run to your pc before you buy/download it..