First do NOT use nvidia's stock drivers against mandriva if you are going to use AIGLX/Xgl.
Use the plf nvidia drivers. That is the recomended way to get best performance and to avoid lot of problems!
Visit this site: http://easyurpmi.zarb.org/
where you can add few medias.
I'd suggest to you to check contrib
At the end you will just need to copy few lines to konsole(ofcourse logged in as a root)
and run it.
Then you need to uninstall nvidia drivers: press ALT+CTRL+F1
login as a "root" and then type:
sh /path/to/nvidia-1.0-XXXX.pgg1.run --uninstall
After that you have to type this:
When it is done type "init 5" to get back to X.