I've had a wireless router setup for a few months now, and it's worked perfectly...until about 2 days ago. My brother's computer has a wireless PCI card. It gets signal, but can't connect to the internet. I go in and run ipconfig...sometimes it has no ip, sometimes it does. If I renew, sometimes it will hang and not renew...sometimes it will renew and the internet will work. Then either later on in the day, or the next day, it loses connection then...but always has a good signal.

Ideas????