Hi,
This thread was moved to Windows 7 Virtualization forum by mistake.
According to the problem description, I realize that the operating system is Windows Vista Home Premium, I will move this thread to the correct forum, Windows Vista Applications forum.
According to the error message, I would like to suggest you check the backup drive’s file system. If the file system is FAT32, you need to convert it to NTFS.
Regards,
Arthur Li - MSFT