Make sure the wireless service is enabled, reset wireless adapters/router, make sure wireless card has up to date drivers, move the pc closer to router if possible.
There are afew things you can do. First you might be out of range from a wireless network. Second reset the router and retry the connection. You can also run a network diagnostic to see what the problem with the network may be. If that does not work call your internet provider.
Well make sure that the wireless router is on and you are close enough to it to pick up the signal. Then make sure the computer's wireless adapter is on and working correctly.
