BootMrg is Missing or Corrupt

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When migrating a physical machine into Hyper-V or VirtualBox or migrating a VirtualBox machine into Hyper-V you’ll find that it won’t boot. In my case the OS was Windows 2008 R2. However this applies to many versions. Actually it applies to many cases of a machine that won’t boot regardless of the situation.

  • Step 1. Obtain an ISO of the operating system DVD and boot into Windows Setup.
  • Step 2. Select Repair Your Computer and choose Command Prompt
  • Step 3.  Run startup repair. This might be your last step.

In the command prompt type cd recovery to change to the recovery directory. Then type startrep.exe and hit enter. This will open the Startup Repair application. Let it run completely. It is checking a large number of issues that could be preventing your computer from booting. Let it run completely at the end it will let you know if it thinks it was successful. Either way, reboot and see if it comes up now.

If it does boot normally then your next step should be to update drivers and remove programs that might be interfering, as in my case, the virtualbox add-ins.

If it does not boot normally then repeat step 1 and step 2. In step three this time run Bootrec /RebuildBcd, then Bootrec /FixMbr and then Bootrec /FixBoot Finally run startrep.exe again.

Your machine should be bootable now. Hoping the best for you.


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