Which drivers I need for LAN connection?

I am writing to you about my problem. We have a BroadBand from BT and I tried to connect another PC to this BroadBand trough LAN cable. But It is doesn't work.
So then I found that I need to instal: Ethernet Controller, PCI Device, PCI Serial Port, PCI Simple Communications Cotroller. Can you give me some tips where I can download the drivers?
I really don't know how to do it, so I will be really glad for some info.
The drivers it should be for a computer HP Compaq dc7800 Small Form Factor PC. We had it in a office.
Thank you for answer

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More about drivers lan connection
  1. it most likely has a realtek ethernet controller, download the latest realtek drivers and install them.
  2. Best answer
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LAN Connection Drivers Windows XP