Xbox 360 + Buffalo router + computer connection problems

[KingAustin]

I recently bought a WRT54G router, just to use as a switch so I could have both my 360 and computer hooked up to the internet. When I start playing on xbox live, it times out my computers connection most of the time. I returned the WRT54g, and got a buffalo WHR-G125. The same problem has been happening and it's confusing the crap out of me. The 360 keeps it's connection just fine, just the computer doesn't. I'm using a college connection (T3), my roommates have their 360's and computers hooked up using routers without any trouble, so any ideas?