My AutoCAD hang, freeze and crash every time

Hello to All

I just bought a new computer with Windonws 8, tried to install it three versions of AutoCAD (2012, 2013 and 2014) however when I try to do any kind of command it it crashes, the screen freezes and no longer responds, responding after a while but again after locking. I've tried running directly from the video card, high priority in processing, change perfomace own in AutoCAD, but nothing worked.

Windows 8-64 bit
Intel Core i7 3.44 hz
License: Student
8 GB - 6GB Cache
NVIDIA GeForce GT 630M | 2GB DDR3 (Dedicated)

Thank you for your attention.

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