How can I share a internets wireless connection to lan via router

OS: Windows 7

Desktop connected to the internet via usb network adapter
The desktop has a lan card

How can I setup the OS so the wireless internet connection is shared to the lan connection to a router to the router can receive an internet connection.

First off you really don't need that router. Second you have to use Internet Connection Sharing which basically turns your Host computer into a router for other devices that are connecting through it. You would need a switch to connect more then one device and that router can be made to work as just a switch.

Read up on Internet Connection Sharing.