We just recently changed our network from WEP to WPA2 security. When you sign up with an Internet Service Provider, they typically give you a router with default settings of WEP security. WEP security is an old encryption method and very easy to breach. You will want to change your security to WPA2, which has stronger encryption and re-encrypts every hour. This makes it difficult for cybercriminals to hack into your network.
The first thing you will want to do is access your router/modem. Browse to http://192.168.1.1
Now create a login ID and password. (This is not to be confused with the name of your network and password to join it.)
Now, call your Internet Service Provider and have them walk you through changing the encryption to WPA2. Once this is done, all of your wifi devices will be kicked off the network. To reconnect a PC/Mac, just "join" the network and enter in the new password that you created for the network's router/modem. (This is not your login ID/password to your router/modem.)
If you have trouble reconnecting your devices to the WPA2 network, just call GeekSquad or AppleCare or whomever supports you and they will walk you through it. Once the settings have been changed, if you lose power, when power comes back on the setting will still be there. Again, if you decide to power down your router/modem, when you power it back up the settings will remain. It is only when you use a paperclip to reset the router/modem that the settings will default back to the factory settings (and WEP).
You need to be aware that cybercrooks no longer have to be near your router to attempt to hack in. They have large antenna which can be ten to twenty miles from you that can pick up the signal of your network. By the way, it is not a good idea to turn off the broadcast of the name of your network. Cybercrooks can still see that a network is there and when they see you have hidden the name from broadcast, they will think that there is something valuable on your network.
There is a second advantage to changing from WEP to WPA2. WEP limits the wifi bandwidth of your network. WPA2 does not. When we had WEP, our typical download/upload wifi speeds were 23/20 mbps. They are now 48/43 mbps.
Good look and Happy Holidays.