Networking Error: Xp and 7 won't network

So today, I was able to network my xp to a windows 7 fine to transfer the same files by connecting them together via ethernet cable. Now, for some reason, when I try to network the computers together, the 7 says its connected fine, but the xp says it has limited to no connectivity. How can one computer be connected while the other has limited to no connectivity?! :upset:

I will not kid you when I say I've been searching Google for 5 hours, only to find all the results are something I don't want. I know the ethernet cable is working fine, and I've tried disabling firewalls, going through various settings, etc., but no results. Hopefully I can get a reply before I figure this out after another 3 days of searching for the solution.

Thanks,

Krishaa