How to change the password in Symantec Client Security 3.x and Symantec AntiVirus Corporate Edition 10.x

Reset the Symantec System Center admin user password
You can use the Password Reset Utility to reset any user's password.
You must have Administrator access to the primary server of the server
group.

To reset the Symantec System Center admin user password

   1. On the computer running Symantec System Center, start Windows
Explorer.
   2. Go to \Program Files\Symantec\Symantec System Center\Tools.
   3. In the right pane, double-click the IFORGOT.exe file.
   4. In the Primary server field, type the name of the server group's
primary server.
   5. In the user field, type admin
   6. In the New Password and Confirm New Password fields, type the
new password.
   7. Click Reset Password.
      You may be prompted for a Windows user name and password if you
specify a remote server.