Black Screen In-game

[Sternjaeger II]

guys, I'm doing this installation for a friend of mine on his iMac with a Windows 7 64bit partition.

The video card is an NVIDIA GeForce 8800GS, and the symptoms are the same of many other here: red square, then game loads, but when starting it it goes back to desktop and you can hear the sim going.. if you press ESC it goes back to the options screen, but that's it.

Video drivers are the latest 296.10 and the game version is the latest with the fix. I've tried the regedit fix but it didn't work.

A thing I've noticed is that it doesn't even show you the planes in 3d on the plane selection menu, there's just a black box in its place.

What I'm trying to do now is reinstalling the game and seeing whether it works fine in its original version, but needless to say any input is appreciated.

It's kinda embarassing cos I talked about this sim to this friend of mine and he was so enthusiastic about it, but now I can't make it work on his machine and it's just so frustrating

I know it works on other iMacs (with an ATI card though), so I was wondering whether it's related to drivers?