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Aftre couple of minutes (differs from a minute to an hour) game freezes and crashes (always if paused after few minutes). And textures have problems (black part of screen) sometimes. Pirated version goes fine. Have you got the same problem? (I have notebook with Intel HD 3000.)
Have you updated your drivers recently? Have you tried running the game in netbook mode?

I have ran the game on my own netbook and left it paused overnight and there was no texture corruption or crashing.

If the problem does persist despite having tried the above, please send an email to our Support team and make sure to include a DxDiag file :D
Drivers are updated, netbook mode doesn't look good, but i will try it. And if there will be problem I will send an email. Thank you.