is there any response when you plug in the cable? it is unlikely that a virus would have damaged the hardware, although it is possible that it released the ip address or edited the MAC address, if you plug in the cable to a different computer then does it work, and if you try a different cable in that computer, does anything happen.
If anyone has been changing settings on your router it is possible to assign an IP address using the router, so that every time a particular computer requests an IP address it gets the same one, i find this prevents good network communication, so you could try undoing this, otherwise there is an equivalent settings in windows, but it must be undone on both the router and windows to make this work.
You can try opening network connections, open the properties of the connection and in the 'the connection uses the following...", click Internet Protocol(TCP/IP) and click properties. then highlight the obtain an IP addres automatically and obtain a DNS server automatically boxes, click OK and try again, if that doesn't work, try the following.
Open command prompt as an Administrator, type "ipconifg /all" without the quotes, then see whether it says there is an ip address, if not, type "ipconfig /release" again without the quotes, it should have a think, then type "ipconfig /renew" and it should again have a pause. once this is finished, try accesing the network again.
post again when you know if either of these worked.
Edited by frank_cheese, 06 July 2009 - 10:21 AM.
Failure is not an option, it comes as Standard with all Windows Operating Systems