Yes you can!! I have the exact model and uses it as a system link for when a couple friends and I link up our xboxes. There should be a small reset button plug in the router and take a paper clip and hold the button down for several seconds untill the lights flash a few times then you are good to go! Plug in your lan cable from the modem into the jack that it is seperate from the others. It will have a different color box around it from the others. Now you are set up to use it as a regular router. Also the reset button may fix your wireless.
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Seconded - try a hard reset Remember, this may turn the wireless back on, and leave it unprotected - so go into the configuration page and either disable wireless or add a strong password.
If the router portion of the thing still works you might be able to. There should be 4 wired router connections in the back that you can plug into as wired connection. But whatever is making it not work as wireless may keep it from working as a wired router.