I've run out of ideas since I can't physically see what's going on with your computer. Here's a link to that modems User guide maybe it'll help you. http://www.motorola.com/staticfiles/...er%20Guide.pdf
If you can't view it I can email it to you or something.
You can also try to reset it by typing in a web browser(whichever one you're using Internet Explorer, Firefox, or Chrome) 192.168.100.1 and that well bring you to a GUI for the modem and you can reset it from there.