WRT54GS - No longer able to connect to internet

Hello
I've been using the WRT54GS for at least three years without any major problems. My set up has two main PCs, one in the basement we'll call F-PC and the other on the second floor we'll call M-PC. F-PC connects via wire to the WRT54GS, which in turn connects to the Motorola cable modem.  M-PC connects wirelessly via a Belkin device.
This weekend I had some problems on M-PC, so re-installed Vista. After the re-install I accidentally ran an .exe file on it which contained a virus called dropper.vb.oq according to AVG, which I only installed after running the exe file. I probably didn't set the firewall up right away either. There were no effects when I ran the .exe, it just didn't visibly do anything.
After deleting the infected file, I noticed that M-PC could no longer connect to the internet. I checked F-PC and same thing. I tried logging in to the router but it wasn't recognising my password, so tonight I reset the modem and re-entered all the settings. Still no luck, yet when I remove the router from F-PC and just plug it directly in to the cable modem, I can get online. I have upgraded the firmware to 4.71.4 tonight.
When I have the router in place, I can't connect to the internet, yet the internet LED on the front of the WRT54GS flickers constantly. I am able to ping the router when I connect it directly to the PC and it works.
My questions are:
1)The failure of the router is probably unconnected to running an infected file, right? Could a virus on a computer wirelessly connected to another really knock out the router?
2)Does anyone have any suggestions as to what might be causing the problem, or should I just buy a new router?
Thanks for taking the time to read
Mark
Message Edited by tannersarms on 04-07-2008 07:58 PM

virus cannot affect router. Seems like a settings issue on router. Who is your ISP? Try cloning MAC address of router with that of your main computer.

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