So I can't connect my new XP machine to the internet...

I just installed windows xp SP3 on a new computer, and the realtek ethernet card isn’t cooperating. I installed the driver and everything, and sometimes webpages will half-load, but that’s it. It’s very similar to this problem, but none of those solutions seem to work. Has anybody else had this issue? I keep getting the “network cable unplugged” or “limited or no connection” notices periodically. Thanks!