Windows 7: Wireless Issue with N routers?

So I built my desktop, installed the RC and was excited to start gaming on it, and everything worked perfectly while I was at home. I have a Rosewill RNX-EasyN1 and the router there was a Linksys WRT54GL. Now I am living with someone else and they have a WRT310N router, and my new setup can hardly load web pages. Speedtest has me at less than 1/12 of what every other computer hooked up to the wirless runs at for download, with upload at about 2/3 performance. The Rosewill USB works fine on my older computer running XP, so I'm left wondering what else could be the problem. Any help would be appreciated.

Ok, I had already checked everything you mentioned earlier except disabling IP6, and that made little/no change. I'm unsure exactly what information you would like to know about my configuration. I do know that the huge differences between this network and my old one are the use of Wireless-N and having a WPA2 security on this connection. If I remember right though, we tried it with security disabled and had no effect. For the record, I've disabled my firewall while testing too, so that should be a non-issue, and have reinstalled the drivers for the USB wireless as well.

Just let me know any other info you could use and I can either give it or ask the guy in charge of the network here for more info. Thanks again.

just for troubleshooting purposes, have you tried using a wire direct to the router to see if the performance issues are the same with that too?

Are the rest of the computers on the home network using N protocol? If not, the router may only be broadcasting only a b/g signal. If you configure it to broadcast a g/n signal it will increase your transmission rate and boost the signal some too.

If everyone is in N protocol, make sure the router is broadcasting N only also.
These have helped me in the past. However, everyones configurations are different.

Ok, so at the very slow speeds I managed to download the latest updates from MS, and lo and behold I'm up and running at about 1/3 to 1/2 of the full 3Mb speed for the connection (terrible, I know). In any case, this works well enough for me, so I'll settle. Thank you for your help guys, I appreciate it.