Question : Internet not working

I lost my internet, but it is there somehow. My peer2peer program downloads and uploads files just fine. But anything else requiring internet does not work(email, IE).
I tried ipconfig release/renew
I can ping myself but not my router or my other computer on the network, nor the DNS server. I get a "general failure"
I have a home network with only two comuters on a Linksys Router and DSL Modem. Running windows XP SP1a.

I recently put Mcafee AntiVirus on it but without a firewall installed, my windows firewall is disabled as well.

Answer : Internet not working

let's start from the beginning
from a prompt type
ipcopnfig /all and post
back to using the p2p software?
probably getting infected