Acronis Backup and Recovery Workstation - Shutdown in the post-command backup not function

Hi,
i already read the articles 8596 present in the forum where describe to create a bat file with the shutdown command and use this in the option post-command after finish backup operation; but if i test command with the acronis button "Test Command", function; when start the backup , the backup function but the the shutdown no.
The Configuration are:
Windows Xp progessional Sp3 whit all important update. No program or antivurs are installed.
Acronis Backup and Recovery Workstation 10 Update 3.
The User for windows are Administator and the user for acronis machine is Administrator.

Thank for your attention.
Matteo.