Try to do a power cycle. turn off everything. then turn on the modem first the the router (if you're using one) then the computers.
check if the cables are properly connected, try to use another cable for hardwired computers. for wireless computers, make sure that it's connecting to the correct wireless network and you are using the correct wireless password (wpa/wep)
if you want to check your wireless settings, just log in to your router's page by typing http://192.168.0.1 on the address bar of your web browser. by default the username is admin and there's no password. you will be prompted by the router's page, go to the wireless section and check the router settings are the same with what the wireless computers are using
hope this'll help you but if you still have a problem, just give me your network setup (i.e. brand of the modem, router, number of computers and if PCs are hardwired or wireless)
cioa!
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