one of my roommies has a winXP (home edition, if it matters) computer that suddenly lacks internet access. Upon checking it, I found that the ip address is automatically assigned, and is not that of the network (ie: is not an internal ip). I tried to manually change the ip settings, but since the computer is not part of the network, I think all I did was set up an ip address that is independent of the network.

How do I fix this?