Executing the vzabackup, vzbackup, and vzmigrate commands right after installing Parallels Virtuozzo Containers 4.6 may result in the error that these commands could not be recognized as internal or external commands:
C:\Documents and Settings\Administrator>vzabackup
'vzabackup' is not recognized as an internal or external command,
operable program or batch file.
User environment variables are not updated for running processes after PVA installation.
Log off the system and log in to it again.