I have a US Robotics Wireless router here. works fine with some computers but not others. It works fine with an old PC desktop , but comes up with an error on an acer laptop. The acer laptop has built in wireless B networking. it finds the network but when I click on "connect" on win XP, it says can't connect to the network, out of range, out of order, etc. any ideas on what I should do? Additionally, on the ibook I use, the signal quality changes often. Sometimes the signal strength is 1 bar, and sometimes its 5 bars. What would cause the signal to be so poor sometimes and so good at other times?