Where can i find Driver for Lan card?

I reinstalled windows xp and internet does not work :( Contacted intrnet providers, they said that the problem is with lan card driver. I download AIDA32 (in order to determine the card), it says that network adapter is "NVIDIA nForce Networking Controller - Packet Scheduler Miniport ..." I really dont have a clue what does it mean. So can someone help me to find the correct driver?