Yes! Join the club!!!
Its such a pain to install the nvidia drivers.
Chances are, that if you're using the Community verison, you will need to make sure your kernel and kernel source are the same.
Check the version of your kernel-source package with 'rpm -q kernel-source'. Check the version of all installed kernels with 'rpm -qa | grep kernel'. Check your running kernel with 'uname -r'.
This site should help if you need updates :
*www.mandrivausers.org/easyurpmi/
You'll also need to edit the XF86Config file. (as root, of course)
since u are a newbie to UNIX/Linux, like me, here's some tips i can give you (thanks to the UNIX book i preserved in a glass jar).
To edit files from the console, type vi <filename> and press enter.
This will give you a nice colorful screen of the config file.
To begin editing, press "I" and the status will show that you are in "insert" mode. Edit away to glory and if you want to save your changes and exit, press ESC, then ":wq". If you want to quite without saving, press "ESC", then ":q!".
It's a real pain man...i'm still trying to figure out how its done.