How to Fix Game Lag on Microsoft Windows 7

1. Defragment the computer. This helps the computer run smoother, helping to speed up games. Windows 7 has a built in defragmenting program. Click the 'Start' button, and type in 'Disk Defragmenter.' Click 'Disk Defragmenter' under 'Programs.' Select the computer's primary hard drive, which is the 'C:' drive. Click 'Defragment disk.'
2. Close unnecessary programs that are running in the background. These programs split your resources, and some games require a lot of power to run. Closing these programs frees up some of your computer's processing capacity.
3. Add new hardware. If your computer does not have a video card, by adding one you can help take pressure off the computer when running a game. A sound card will do the same. Also, if you can increase the amount of RAM available, the computer will have more memory to run large programs such as high-end video games.