Running Multiple Simultaneous Networks?

I would like to be able to use 2 networks at the same time, one is a wireless internet connection through my USB adapter, and the other is a wired Ethernet connection to separate router, which i use to connect to a Playstation 3 with Playstation Media Server. Frequently I am wanting to download a video from the internet while watching a different one on the PS3. he problem is when I connect both networks, I am unable to use the internet.nd what I have learned.

1. I made sure that the two networks have very different IP addresses and Default Gateways.

2. I have tried to change the priorities of the networks through Control Panel>Network and Internet>Network and Sharing Center>Change Adapter Settings. Then right clicking the connections, clicking Properties, clicking both Internet Protocol Properties (one at a time), clicking Advanced, un-checking Automatic metric, and placing my own values. Obviously i set the wireless to the lowest priority and the wired higher.

3. Also in the Network Connections list, pressing Alt, clicking Advanced, then clicking Advanced Settings; I set the order of the connections, wireless first, then wired.

(Also I did reboot the system after trying each thing)Going to command prompt and typing "netstat -rp", under Interface List I am shown the metric priorities of network devices.It seems no matter how I try changing priorities or access orders or anything, those values do not change. I am thinking if the priority of the wireless adapter was first, I would be able to use the internet while connected to both networks, and still be able to stream to the PS3 through the wired connection.