Fresh install of Windows XP, can't connect to the internet.

I'll keep this short. I just bought a new hard drive and I have done a fresh install of Windows XP Home Edition. However, whenever I try to set up a home network, it does not allow me to do so. Obviously this because of the lack of network drivers but the problem is that I don't know which exact drivers I should download...

My PC specs are as follows:
PC: Dell Optiplex 745
Processor: Core 2 Duo 2.66 GHz
Motherboard: Dell Inc. 0GX297

Additional note: I have two PC's in the house, the one I've installed the new hard drive on is connected to a router via a ethernet cable and not a wireless modem, etc.

Thanks for any help given!