Alright my cousin has a problem where trying to play CoD4, Gunz, TF2, CoD:WaW

He keeps getting the same error, cant connect to server after 30 retrys,(cant see servers in CoD4) we tried increasing the amount of retrys but did nothing... we keyed the problem to the router or modem, does anyone know info to help? (We openes the ports too)(Closed Firewalls)

He also has DSL and runs on Vista