answer:It is an unfortunate truth that many hardware for PCs are not accepted by all operating systems. A similar thing happened way back when I upgraded from Windows ME (what the computer came with) to Windows 2000 – the new OS did not support my sound card, so I had a silent computer. If the video game is “choppy” you may not have enough RAM to support Windows 7 and the video game simultaneously. I would buy new RAM from a place like newegg.com (be sure to look through the reviews) and install it. If you still have the disks that came with your computer, many of the drivers may be on those disks. If you don’t, you may be out of luck.