Windows 7: limited access wireless network

I keep losing my internet connectiion. I have a linksys wusb600n that is connected which has the win 7 drivers. It was connected to a linksys router now a trendnet router so I know it cant be the router. Anywho I'm able to connect just fine. The problem is as soon I try to download a large file or watch a couple of videos I lose Internet connection and get the yellow triangle that says I have limited access. It stills shows that I have a strong signal. In the adapter properties IPV4 says no internet access. I tried the troubleshoot and nothing. I tried the command prompt ipconfig release and it says that it cant do it while the media is disconnected. If I try to disable the network adapter it hangs and doesn't do anything. Same thing if I try to restart or shutdown. It just stays on the screen where its says it shutting down or restarting. I have to actually hold down the power button to turn it off. Once the computer is on I'm able to surf again until the limited access happens again. I'm want to keep windows 7 as I'm on the RC and would like to buy home premium but not if I can't resolve this. Please any help.