The version on the computer I'm trying to access is 10.4.10, and I'm trying to change the sole user (with Admin priv) on the computer. The only other user is the guest account. I realized after I posted previously that I was using the FileVaultMaster keys from a later version (Leopard). I will have to find a 10.4 and try again. Or do you think that it will work as long it's Tiger?
Thanks for your response!