When I boot my PC from my 2nd HD, also in Windows XP, my internet works fine, meaning it's something wrong with Windows in my main drive. What could have been messed up that would cause this?
Other info:
It seems that there's a problem renewing the IP address. When I look at the properties section for the TCP/IP config, the "Default Gateway" is blank, and I can't even access the DSL modem directly (by using it's local IP address, 192.168.1.254).