Slow wired connection with WRT54G

My ISP is Comcast.
I'm using their modem which includes my digital voice connection. From there I'm wired straight to the WRT54G and from there I'm wired to my PC. However, when I connect from the Comcast modem to my PC I get download speeds of 12mbps and when I connect from the WRT54G (wired) it drops to 1mbps or even 786kbps.
I've tried resetting the modem and the router. I've tried changing the MTU. I have the latest firmware version (v8.0.2). The last resort is getting a new cable modem (suggested in the forums) but I think that's out of the question since my digital voice is connected to the Comcast modem.
Any other suggestions? Thanks in advance!

Please state the make and exact model number of your modem (not the WRT54G).
Using an ethernet cable, wire your computer directly to the modem (not the WRT54G).  Verify that you have a properly working Internet connection.  Then do the following:
Go to "Start" > All Programs > Accessories > Command Prompt.
A black DOS box will appear. Type in "ipconfig /all" (with no quotes), then hit the Enter key.  Copy all the results to your next post, except that if your "IP address" does not start with 192, then post only the first 3 digits of your "IP address" along with the rest of the info.

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