How are you connected to the Internet ?
As for the network card, installing nVidia drivers should install a "nvnet" module. This is the module that you want to load in order to get your network card working.
In your /etc/modules.conf file, you should have a line like this :
Then you need to edit the file /etc/sysconfig/networking-scripts/ifcfg-eth0
Code:
DEVICE=eth0 #the device to which the card is linked
BOOTPROTO=dhcp #speaks for itself
HWADDR=xx:xx:xx:xx:xx:xx #MAC adress of the card (optional)
ONBOOT=yes #activate the connection at startup
TYPE=Ethernet
If you don't feel like editing the 2nd file, you can always open a command prompt & type rehat-config-network.