Wireless connection issues (to be origional lol)

Question

i have one main pc that is linked by ethernet cable to a 2wire wireless router and i managed to connect a laptop and ps3 to it wirelessly(they have been working fine for about 6months, about half a week ago the ps3 started becoming incredibly slow and now the laptop is not connecting to it either. i tryed detecting the wireless signal with my psp and the signal isnt even appearing. i have tryed turning the power to the router on and off but apart from that i dont really know what to try. any help or ideas would be much apreciated :)