I just tried to install the new NVIDIA Drivers for the GeForce 4 4600 on my Mandrake 9 system. The kernel driver installed fine but the GLX driver gave me an error when it installed and my screen froze so I rebooted. After rebooting, I cannot get into Xwindows any more. It gives me some kind of error with the GLX driver. Is there any way that I can uninstall these drivers and go back to the old ones or can someone give me some info on how to fix this problem?

Were you in X while installing drivers? And how the drivers came in, rpms or tar.gz?

I was in X and they were rpm files!

Well, you read the docs!!! You are not supposed to be in X environment while installing NVIDIA drivers, now go to init 3, in Konsole become root with su
/bin/su
Password: <----- enter root's password here
/sbin/init 3
the system will go to runlevel 3, login as a regular user, become root again with su, and issue
rpm -e NVIDIA_kernel
now install the RPM's from command line
rpm -ihv /path/to/NVIDIA_kernel-yada.yada.rpm /path/to/NVIDIA_GLX-yada.yada.rpm
edit /etc/X11/XF86Config-4 file according to the installation instructions provided on NVIDIA site,exit off root with
exit
and issue as a regular user
startx
if you see NVIDIA logo you are most probably fine.