I was asked to look at unlocking a Windows 2003 Server Symantec System centre whos documented name and password didnt work.
If you a) update the "user-admin-p" registry entry -
HKEY_LOCAL_MACHINE\SOFTWARE\Intel\LANDesk\VirusProtect6\CurrentVersion\Accounts (more details here)
and then b) run the iforgot.exe program in the Program Files\Symantec\Symantec System Center\Tools folder
then you can reset the user account's password.