Hypervisor not running error has come due to disable
DEP in BIOS. Due to this VHD file might get detached.
As the result, VHD file unable to mount in Virtual
environment. To resolve this issue you need to follow
some steps to stop error 12700 Hypervisor not running.
If the error still come again and again then, try
external professional tool like: Hyper-V recovery
software. It facilitates the user to repair
inaccessible VHD file with its simple GUI techniques in
few simple clicks. It has recently updated and provides
improved scanning modes: Quick and Advance. Software
deeply scans and repairs multiple partitions of Hyper-V
Virtual machine hard drive with these scanning methods.
This tool automatically saves the entire information of
these scanned partitions and permits to re-load them
without re-scan. MBR corruption repair task of static
VHD file is also possible via this tool as it has added
“Raw” scan mode to handle this situation. Use the free
evaluation copy of this Hyper-V recovery software
application and see how it performs data recovery from
VHD corruption, damage condition, inaccessibility and
deleted/lost or missing files/folders. If you have a
query that how to restore data from VHD file then, you
need to obtain the full version of Hyper-V recovery
software because only full version permits you to
restore repaired and recovered VHD file data on your
desired location. For more:
http://www.vhdrecovery.com/hypervisor-not-running-error.html

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