I am running an old G5 iMac. When I got the message from Apple to upgrade from OS X10.5 to 10.5.8 I did it and ever since, my Administrator has gone bonkers and I am locked out of everything. It won't recognize my password. I have tried all the ways to change it, including the "hackers" versions - and nothing has worked. I have used the install CD and reset the password, and as soon as I restart my system - it has gone back to not recognizing me as the administrator. I have tried to download virus software, but I don't have administrator privileges to load it. This is a nightmare. Is there any help out there? I can't even pull the HD on this machine. HELP!!!!