I wouldn't recommend renaming nwmain.exe simply for the fact that you're likely to cause issues with other aspects of the game (e.g. utilities) that rely on an interface with nwmain.exe. There is a considerable self help section on these boards that deals specifically with AMD/ATI cards and Windows Vista/7/8 installations.
I would first look to see if DirectX 9 components are missing. Doubtful because the game ran fine before installing the new card, but you never know. Download the DirectX 9 SDK and run it. It'll install any missing components.
Next update your audio and video drivers to the latest versions. If you have a RealTek audio card, this might be the culprit.
If you are still having issues, look to the self-help forum here.
Sorry my first post wasn't more helpful. In my experience, over several models of computers, sooner or later AMD/ATI GPUs have always caused issues. I have NEVER had an issue with an nVidia GPU running ANY game. Wish I could say the same for AMD/ATI cards but I can't. IMO, nVidia is the better card for ALL games and applications and Intel processors have no peer from AMD.
Modifié par Pstemarie, 19 juillet 2013 - 11:09 .