Just installed NWN Diamond Edition into Windows 7, all went OK until I tried to run the game i got the message that it had stopped working, tired running as Admin same error, so at the moment I have a
game that does not work for me :(

OK, got it going now got other issues, got to sort out something called the catalyst control center, whatever that maybe.

Rule 1: make sure you *never* install games to 'Program Files'. If you have, uninstall and reinstall to somewhere like C:\Games\

Rule 2: if a newly installed game refuses to run, try disabling your antivirus. Some are overzealous and prevent proper execution.

http://www.tomsguide.com/us/catalyst-control-center,review-2012.html