I would set the WiFi for G mode only at 2.4Ghz and set a WPA password. Review the Gaming and Gamefuel sticky for a good setup that works well. It's what I use. Check the Firewall settings and turn off the options that you don't need or use on the router, stuff like proctected WiFi and WISH. Let us know how it goes. Test with one devices connected wired, then add a wireless device and see how it goes.