Ok, so I have the Diamond edition on disc and Windows 7 on a dual-core computer. Using the install instructions for Windows 7 found in these forums, the game runs perfectly. No hiccups, max settings, no crashes whatsoever.
However I cannot even load the Toolset. It gives me the "cannot create 3d preview window, update your drivers" message every time.
My computer and all its software are 100% up to date. What's wrong here, and can I fix it? My graphics card is ATI Mobility Radeon HD 4650 and I have all patches installed for the game.