ASUS had to replace the motherboard in my notebook with a new one that and now the wireless card won't connect. I get Network Security Key Mismatch and the key is correct I can connect with it on any other computer in my home. I've also tried other wireless adapters and get the same result so I don't think it's the card in the notebook.Wilson

If the motherboard was replaced and you retained the same Windows 7 load, remove your wireless settings. Also, log into the router with a hard-line and remove any entries that contain your computers IP address or MAC address (DHCP tried to issue the same address to the same MAC when possible). Once you have done that, try to reset up your wireless connection again.