Could get on the internet, but now can't

I've been using 360 for about a month now, and I haven't had any problems until just recently.  I have no problem connection to my home wireless network, but i've been travelling recently, and I'm having issues connecting with the hotels wireless where i am.  I'm on my work internet right now.

 

When i first arrived, i could get online.  After a while, i started suffering random disconnects, and for about two days i haven't been able to get online at all.  At first i thought it might be the router, since i'm not exactly at a 4 star hotel, but other people have been able to get online, and my computer seems to connect to the router, it just won't go through to the net.  I've tried turning off the firewall, but that hasn't helped.  I'm going to be here a while, so i kind of need internet.  Any ideas?  I'm running vista btw.