Try copying the dll to the D2:DC 'bin' folder, as well.
Did the setup from nvidia install properly, but the game still gives the error, or did it also have a problem?
For the 'quiet' install that bypasses the UI (if required), in Windows Explorer you just need to right click on the PhysX installer and select 'Create shortcut'. Next, right click on the shortcut and select Properties; in the window that comes up, in the Shortcut tab (which it opens to), there is a 'Target' text box listing the full path to the setup program, in quotes. If you click at/near the end of the text box and use the arrow keys to move the text cursor to the end (if required), you can hit the spacebar and then type in
/quiet and hit the OK button. When running the PhysX setup from the shortcut, it should then skip the UI, which will hopefully avoid whatever the problem was when you tried to install it normally.
![[Linked Image]](http://members.shaw.ca/egodraconis/physxquiet.png)