I have three computers in a network at my house connected to a linksys 4 port switch/router. Everything had been working perfectly for a long time. Then my main computer stopped working with some aspects of the network. Everything from an HTTP server seems to work fine, but when I try to connect to anything else something stops the connection.

Here's the parts that sort of has me stumped. The other two computers on the network do everything perfectly, ruling out the router as the problem, and even so, I reset it, having the same problem. I also have the same problem when connected directly to the cable modem.

A few days after the problem started, my mobo fried, so I had to replace it. The problem didn't go away, but I couldn't connect to the microsft activation server for my new mobo, so I had to call them and get my number. I reinstalled the card and my TCP/IP related things several times, but I belive I am missing something, or else all the settings would fall back to default and things would be just fine, they aren't. I have all firewall related things on the machine turned off, and uninstalled if possible.

I am able to ping the problem machine normally through any other computer on the network, but cannot ping from the problem machine.

Please help. If you need ANY information I didn't provide please ask.