Hi,
This issue occurs when the bootmgr is not installed on the hard drive that windows is installed. When you are trying to boot to windows, the one without bootmgr.
To resolve the issue, either unplug the hard disk with window and replug it as the first priority on BIOS or copy bootmgr from another computer and paste it on the windows hard disk.
For more information, please refer to
http://social.technet.microsoft.com/Forums/en/itprovistasetup/thread/e6e2399c-746a-4d45-8b77-dc6e89fd9409
Regards,
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