I have a linksys wireless usb card and it is not

We need to know the wireless settings on your wireless access-point/router.

Check if the SSID broadcast is enabled on the wireless access-point. If it is disabled, then you have to manually add the SSID to the wireless adapter and make sure the wireless security such as WEP or WPA keys are correct.

You may also enable SSID broadcast so that the wireless adapter will detect your wireless network.

Also, you may try to change the wireless channel to 6 or 11.