How to install a new vid card?

Ok I just got my ATI Radeon 9100 128meg card and I was wonfering what I need to do to install it. Like I have a geforce 2MX and I am wondering what I need to delete so that the nvidia drivers don't interfere with the ATi drivers. I know how to open computer and install all that crap but I need to know just what to dlete so I don't get any interference.

theres a great link at the top called "search" it works very good

http://forum.oc-forums.com/vb/showthread.php?s=&threadid=168944&highlight=removing+drivers