Macbook won't connect to wireless even though it has full service

I have a macbook (not the newest version) and I have never had a problem connecting to wireless networks. I have a Linksys router. The connection will work in my living room, but when i walk to my room (on the same floor of the house) it doesn't work. It says it is fully connected but it won't actually connect to any webpages or chat programs. My roommate has a macbook as well and it works for her all over the house...even while sitting right next to me in my room! I have compared out settings and made sure mine look exactly like hers but for some reason it still won't connect!! This is driving me nuts! Oh, and my airport is up to date. Can anyone help please?

maybe check your "interference robustness" setting.