If your not using the wireless turn it off. If you are using the wireless router do not use WEP encryption its better to use none (not recommended) than use WEP and have a false sense of security. Its best to use WPA-PSK (PSK = Pre-Shared key) and use a WPA key generator
to generate a hexidecimal key you will want a 63 character 504 bit key or the largest that your router supports. A tip if your having a difficult time remembering the pass word is to copy it to a word file and save the file on a USB drive and cut and past it to your wireless settings on each computer. Remember to erase the word file containing the key so no one stumbles on it accidently.
Systems and Network Engineer
Certified CompTia Network +, A +