I am in the process of adding another computer to my wireless network and was previously having trouble locating the encryption key but I have remembered that I used key index 1 when setting up 64 bit WEP encryption. Is it simply a case of plugging those numbers into the wireless card I am using to set up or do I need to do something else. I am not too techy when it comes to these things. Thanks.

You can go right into your router through the main system and change the key at will as well as adding the new system. When you try to connect to the wi-fi with the new system it will ask for the key. Enter it and you should be good to go.