|"my connection on both of them is one bar"|
Do you mean one bar of the wireless signal strength indicator?
If yes, try changing the wireless channel to a higher number in your router's configuration web-page utility.
Too low a wireless channel can cause a poor wireless signal.
You might also improve the situation by buying your own better-quality router. Some of the free ones supplied by ISPs are very basic, and in some cases, total crap.