How do I get a copy of the settings on my Speedstream 5100? They say go to http://speedstream or 192.168.0.1, but the pages are not found. I can't find any upnp device they talk about. I have windows 7.

All info you need can be found here ==> http://www.dslreports.com/faq/amfaq/2.2_Efficient_5100_Ethernet_modem

Yes you can. Connect the ethernet cable (circled in the image below) from your speedstream modem to the Lan port on your router. Hope this helps.

Here are the instruction link from Manufacturers website. You have to have basic network understanding to follow the steps.
http://portforward.com/english/routers/port_forwarding/Efficient-Siemens/Speedstream-5100/Command_and_Conquer_Generals.htm

you need to get the firmware updated from the internet service provider and for drivers here's the link
http://www.bioticaindia.com/speedstream-5100.html

in your browser type 192.16.0.1 and it will take you to the modem admin page.

Press the check connection button and it will tell you how your connections are doing. If it shows DSL/Internet down, then most likely your ISP is down 95% likely), or your modem is bad (happens pretty often with these things)

If it doesn't take you to the page, try using 10.0.0.1
some of the newer 5100s have that as their address. Same options and advice.

change the software cd and try again

Option 1 (easy)
you could buy a switch or router and put in line with your modem.
you will have to set up appropriate networking on the xbox
DSL --> MODEM --> SWITCH <-- PC
^---- XBOX

Option 2 (harder)
you could get a wired/wireless AP (Access Point) for your PC and run ICS (Internet Connection Sharing) through Windows. connect the XBOX through your PC

I have Centurytel myself, so maybe I can help:

A link to your Speedstream 5100 router:

http://www2.windstream.net/downloads/links/SpeedStream211.pdf

And the typical setup for the westell 6100 that centurytel uses:

Centurytel will provide you with your username and password.

PPPoE Configuration:
VPI 8
VCI 35
Protocol: PPPoE

Hope this helps.

The underlying Ethernet connectivity required for the broaband connection was not found. Please install and enable the Ethernet adapter on your computer via the Network Connections folder before attempting this connection.

If u don know to install the ethernet adapter pls do contact your vendor