nVidia Driver Installation Guide:
The nVidia drivers have become a lot easier to install over the years. In a few short steps you can be up and running.

Press Crtl+Alt+F1 to get to the command line. If a login prompt is present, login as root.

Run the follow commands:
su
(enter your root password, if needed)
export IGNORE_CC_MISMATCH=1
/etc/init.d/gdm stop
wget http://download.nvidia.com/XFree86/Linu ... 6-pkg2.run
sh 1.0-4496/NVIDIA-Linux-x86-1.0-4496-pkg2.run
(Accept the Agreement, Select No)
(Once your back to the command line continue)
vim /etc/X11/XF86Config-4
(Press Insert to edit the file)
(Change Load "GLcore" to # Load "GLcore")
(Add the line Load "v4l")(Find a line that starts with Driver. Next to it is the name of your current video driver surrounded by two quotes. Change the name of the driver to nvidia. So the line should read Driver "nvidia")
(Your almost done!)
(Type Esc and then :w! and then enter)
(You may then exit with :q)
/etc/init.d/gdm start

You should now see an nVidia splash screen. MythTV should load automatically shortly after.

ok I'll add the nVidia driver stuff... and I think I already have the XMLTV update, but I'll make sure.