Why not get the wireless working on the 2wire, that should be straightforward, simpler and something ATT tech support can probably help you figure out.
But yes you can plug the MSFT one into the 2wire router and it'll provide wireless access- depending on how the 2wire's configured you'll have to configure the MSFT one as an 'access point'.
There's a small reset button you can press with a pointy object to reset it to its default settings. With the default settings you can access it through the web browser at address 192.168.2.1 and password 'admin' - your laptop should be plugged into the MSFT router and may even have to manually set your IP address of the laptop to 192.168.2.2 to connect to it.
NM, yeah I just helped her to help her...no strings attached.
Me: 35|WAW: 38|D: 6yo | http://tinyurl.com/2dxx7m6 Feb 2006, left, came back in two weeks Aug 2006, left again Apr 2007, filed for divorce Dec 2007, reunited Mar 2010, moved out, filed again