Wireless connection not connected, but still have limited use

Hello,

I've been battling my internet connection for the last two weeks - ever since my landlords changed the wireless settings (from WPA2 to shared...they're having trouble with their router I think), and now I can't seem to maintain a connection. When I try to connect, it says Connecting to the wireless network failed - however, I am still able to browse etc for a few minutes - the internet appears to work even though my desktop is telling me I'm not connected - and then a few minutes later I get another message saying "could not connect to preferred network" or whatever that generic message is, and then it stops working completely. If I repair the connection, same thing happens....so basically I can use the internet but I have to refresh my connection every couple minutes, which means no streaming, no gaming, etc....very frustrating.

I just bought a new wireless adapter, an ASUS USB-N13, but I'm fairly certain it's not the adapter - I tried using my old one, and the exact same thing happened. I've tried things like resetting winsock, my IP, etc, but nothing seems to fix the problem. More frustrating is that I don't have access to the actual router, and can't even talk directly to my landlords about it (some weird policy, they only want to deal with my roommate, who is subletting to me).

Now, the wireless is working for my roomie....so the problem must be with my computer. I tried searching online for a cure to this, but no luck.

Any help would be greatly appreciated.

Thanks,
Kat