Is the wireless router on your main PC, or on the modem that connects you to the Internet?
If you have a choice about where to connect it, I'd feed the modem to the wireless router, and hard-wire the desktop PC to the router bit. That leaves you with the wireless which can be configured however you decide.
I never got on with wireless or routers connected to the PC - it adds a level of complexity that doesn't help. Connect the PC to the router, not vice-versa.