i've just upgraded from Vista x86 to Win 7 x64... but now ARENA + cams FLEX V100 don't go... it doesn't start, but says:
"Direct X Application
Switching to the reference rasterizer, a software device that implements the entire Direct3D feature set, but runs very slowly."
And then, when i press OK:
"Failed creating Direct3D device."
Please, help me!

I know Arena 1.4 is an old release, but i'm a student and i'm using Optitrack system for my degree thesis... If i could, i'd upgrade immediately, but this mocap system is property of my university...
Thanks in advance,
Alex