Xbox Live connection Help

Hello so i cannot connect to Xbox live anymore. I have a windows 7 desktop in my room that connects to the internet wirelessly with a USB adapter. In my room i also have an Xbox 360. I use an Ethernet cable to connect the two and about a month ago i could connect to Xbox flawlessly, but now i cant connect at all. I have tried about all i know about this. I have tried ICS with the wireless internet and local internet connections but when i do that the Xbox only connects to the network and not internet. Ive tried bridging connections but when i do this the Xbox doesn't connect to the network. Ive also restarted my modem and router downstairs but nothing seems to work. Help?

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