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Cad Model dissapears then reappears...

This may be more of a pc question for the experts out there!

just put 2012 mr1 Offline on computer. The cad model will just dissapear, and reapear randomly when i zoom in and out, or rotate!

Now, I don't think it is a program error, because my NX cad program does it too. So i am thinking graphics card??

Dell
Windows7
Intel Xeon 5140 2.33ghz
2 GB Ram

Thoughts???

Thanks, Sam