Afterwards install the latest Nvidia PhysX System Software
to ensure newer PhysX games will also work properly (this doesn't remove the Legacy Driver's files).
Are you sure this step is necessary??
I just recently upgraded my Nvidia driver to the 12/29/2012 version (310.90) and was surprised to find when I went to play Two Worlds again (I have played it over 100 hours on this machine, but hadn't in about two months) it would crash on startup everytime.
So, I installed the legacy drivers, per your first link here (THANK YOU VERY MUCH!!!!), but didn't the second because I literally just upgraded a few days ago, so I'm thinking it's not necessary to reinstall the new ones. So I was wondering if you sure this additional step was necessary.
I suppose I could just do it and see if anything is messed up, but I get so worried about things like this that I usually try and be more safe than sorry, so if anyone knows FOR SURE whether this additional step (reinstalling the new Physx drivers) is necessary.
Thanks again for solving my problem though. MANY MANY THANKS. I couldn't figure out what the heck was going on because I've played that game so many times and so many hours and had zero problems. Then suddenly it wouldn't run AT ALL. But I come here, and within minutes find a solution. You guys here at GOG are just AWESOME!!!
Thank you again.