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First things first, lets get the router working with wired connections. Once that is in place you can look at the wireless setup.
1) If you have made any configuration changes to the router's settings, do a reset to get it back to the default factory settings.
2) On your computer, make sure that the network card setting (control panel > network connections) is to auto detect an IP address
3) In internet explorer tools > options, make sure the connections are set to auto detect, and never dial
4) Power off everything - computers, modem, router.
5) Unplug any USB and ethernet leads connected to the modem.
6) Connect an ethernet lead between the modem and router's WAN (internet) port.
7) Connect an ethernet lead between one of the router's LAN ports and a computer
8) Power on modem, allow to settle, power on router, let settle, power PC, let settle. Hopefully you now have an internet connection.