My main computer won't connect to my network

Hi there,

I have four computers in the house, two that are wired to my router and two that are wireless. I recently went away for a few days so I shut down all my computers and unplugged them. Now my main computer won't connect to my network or the internet. It is wired directly to my router.

The other computers in my house are working fine. I have tried unplugging my router and modem and restarting everything. My main computer is a Dual Core with Vista Basic loaded on it. At the same time, I noticed that the computer is not reading anything that I plug into a USB port. I don't know if the two problems are connected or not.

Any thoughts or suggestions? Thanks very much.