Sorry Jimit87, but i have to disagree. Without the proper analysis, you have no idea if your recommendation will work.

Hanging of 3d can be caused by either hardware or software. If software it could be because of a driver.

So reformating if it is a hardware issue, will not make the problem disapear. Reformating if it is a driver issue will also not make it disappear as you would be installing the same drivers as being used.

I do recommend that you check your memory first, check your drivers, check direct x before taking the drastic course of a full reinstall.