Package Manager (Pkgmgr.exe) does not Report Corrupted Windows Vista Images
To work around this problem, discard the Windows Vista image and build a new image by using the last known valid Windows Vista image. You must not distribute the image if at any time package manager returns an error. This is the case even though later attempts to service the image do not return an error. Servicing operations for corrupted images may not apply later critical updates.
When you service an offline Windows Vista image, make sure that all offline servicing actions are successful. If there are any failures, discard the potentially corrupted Windows Vista image.