You know you have stumbled into a video editing forum right? We don't play games here, well most of us don't subject our computers to that sort of thing, it can change things too much.
In as simple a computer language as I can, I would recommend the following:
1. Go the the nvidia site and download the latest drivers. Do a clean instal of them (You click the options button in the instal program)
2. Then go to Microsoft update under the start menu and do an update to your computer.
That will atleast bring you up to date.
Lastly, I am sure there must be a forum for Minecraft or what ever game you are having trouble with. If what I have suggested doesn't fix your problem, someone there will have a fix. You can also check the game developers web site for known issues and perhaps they can fix it for you.
Hope this helps.
Darren