|If your sister's 2wire is the same as my 2wire then it's a combination unit. By that I mean, it's a router, wireless access point, and a modem.|
Your Linksys won't work without a modem between it and your internet connection. Since the modem is part of the 2wire, you can't replace it unless you have another modem.
Now, I can, and likely will, ask my provider for a modem that is just a modem and nothing more. If your sister did the same (ie: got a modem from her ISP that was nothing but a modem), then you could put your linksys on the line after the modem and it would work.
If you're sure the issue is the router, you could try resetting it to factory defaults and then reconfigure everything. However, before you do that, it would be best to rule out the computer running your game and TS server. Because it would suck totally to redo the router, then replace it, only to find out in the end, something was wrong with the computers.
If you're trying to host both the game and TS on the same box, that's not a great idea either.....just FYI.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.