How do connect to Xbox live wireless without turning on computer?

I have a wireless connection to my Xbox 360 for Xbox live. Right now I have to turn on my desktop PC and connect to internet so I can connect to Xbox live on my Xbox 360. Is there a way to connect to Xbox live without turning on my PC?

Public Comments

1. why would your PC need to be on? do you not have a router?
2. If its a wireless router you are using then the wireless connection should be constantly on whether your pc is on or off
3. if its wireless from PC via a card or adapter there is no way to turn off your PC while on live. if its a wireless modem / router it's a constant wirless connection and should need a PC to have it on.