Changing admin password when old password not known
Unable to change an admin password using a Snow Leopard system disc. I know not to actually install the system software but instead navigate to the Change Password under the Utilities menu. Nevertheless, I always get the request to enter the unknown password. This procedure is well known to me and I am puzzled with this current outcome. Any help to help me overcome my 'duh' moment will be appreciated.
Computer is an MacbookPro8,3 OS 10.6.8