Hi, I am a computer consultant, and have had a real problem recently while setting up a wireless network. I dont know which sytem you are using, my clients was a Belkin, and I was experiencing the same problem as you. Firstly ensure there is nothing like a digital phone which could affect the signal, secondly, if you are running Windows Xp, try a system restore and take it back to the date when the system last worked ok, failing that Belkin and some other products require software updates (Firmware update) This was the problem with the router I was using, and after updating the firmware, and resetting the modem, and computer, it all came back into action. Give it a try.