Try the following solution..

Right click on your computer > Manage > select "Device Manager" on the left panel > on the right panel find "Network Adapter" and expand it > find your Wireless card then right click and uninstall it, when you were prompt to confirm your uninstalling, check the "Delete the driver software from your device". Now restart your computer, if you are running Vista or Win7, the OS will install your driver again for you. if not, go to Device Manager again and click on "Action" on the menu, then select "scan for hardware changes", it will add back your wireless card driver which you deleted.

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