Okay, it's our own engine throwing the error. Happens right after we try to initialize PhysX and if that fails, PhysX returns an error, and we throw this message.
I just installed PhysX 9.09.1112 and ran DIV2 through Steam and the game still works. I am however working on XP, not Win7 64bit. Will keep asking round and see if we can find a Windows 7 machine.
