Question : Unable to rnew IP address

Hello,
I'm having trouble with a Dell Dimension 2400 that has an integrated NIC and a cable modem. This is a friends machine but from what I understand it was working OK and then it suddenly it couldn't connect to the internet. I'm not a network person so my knowledge is pretty basic, I tried IPCONFIG /RELEASE and IPCONFIG /RENEW and it throws an error about "adapter is not in the state premissable for this operation". I've Googled and tried the Winstock fix, removing the drivers, etc. I've connected the machine to a cable modem with cable that I know to work.
The connection icon in the taskbar says that it has limited or no connectivity.
If I give it a static IP it says that it's connected but I still can't connect to the internet

Thanks

Answer : Unable to rnew IP address

I located the problem, there was a firewall left from another ISP. It looks like when they removed the software they didn't use Add/Remove programs. Anyway I was looking at the services that were running and saw it there, disabled it and everything works fine.
Thanks for the help