Hi. I have two computers both running Windows 7 and both connected thru a 2wire Wireless G modem/router. Problem is, transfer speeds between two computers on the same network are surprisingly slow. I installed TeraCopy on recommendation from a friend which sped things up a bit, but I still max out at around 1 MB/s, even when there is no other network activity. That's barely more than I get downloading from the Internet!
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It sounds like one of those PCs is only getting a 10Mbps connection to the router. Look at the link status to see which has the problem and then try a new Ethernet cable.