1st you want to check device manager in control panel. Under your computer name there should be network adapters. Check the adapters and if the wireless/WiFi adapter has a yellow warning sign next to it then chances are there is a problem with your drivers. You would want to uninstall the driver. Then you right click on your computer name and scan for hardware changes. The adapter should reinstall the driver. If this does not work then you should download divers for the adapter. Google the exact name of the adapter and download the dirivers for the adapter relevent for your windows version. Then uninstall the divers again but this time click (tick) the delete driver software for this device. You would then scan for hardware changes...