For your discrete video card not being detected - you want to use:
http://dege.freeweb.hu/dgVoodoo2/dgVoodoo2.html
Ignore the warning about the site - if you research it you'll see it gets whitelisted by the various vendors eventually. Don't forget to edit the ini to remove the watermark it imposes.
As far as your models not loading - that's almost always caused what Videri said and the patch not being applied correctly. Reinstall, and make sure you only replace the files within the various directories and not the directories themselves. Depending on what zip extraction utility you're using it has different options. I use 7-zip and the default "replace" option only replaces files and not the entire directories.
-Mcoy