Whenever i select an object in ze and push c than use the mouse to try to move it up and down it freezes for a second, a black line appears mommentarily, and doesnt move up or down. if anyone knows why this is happening would you please tell me how to fix it.

This is a computer hardware issue. You need to upgrade the computer graphics card. I recomend getting a Nvidia graphics card that has 256 MB or more.