I bought myself a new NB with Vista OS. When I tried to install Dassault Systems Catia, the system just denied that option. Some friends told me that the reason is Vista doesn't support cracked programs, but on the other side, I have TONS of such things, and they make no trouble at all. So I don't really know. Could someone pls help me?

CATIA does not support Windows Vista at this time.

I'm sure there are a few loopholes around this but I don't condone piracy.

Hmmm never mind, we already tried that even with legally bought software belonging to University and no luck... I guess the last option is to change Vista back for XP.
But thanks anyway :)