Move your ps3 or router to where you can connect the ps3 directly to the router with a wire... If you get 4 bars then, then it is your router's wireless... Try to connect wirelessly with it in the same room after the wired connection and see if you get 4 bars if so it is just the position of your router and you just need to move it closer to your ps3.... but as I said if it isnt four bars then you need to buy a new router...