After installing Hyper-V on Windows 8.1 Pro, my computer won't boot

I have a somewhat new (June 2013) HP laptop originally running Windows 8 Pro. I installed the Hyper-V component right away and it was running great. After testing Windows 8.1 Pro on another computer a couple months ago, I decided to upgrade my HP laptop and
Hyper-V continued to work great after the upgrade.
Yesterday, after a Windows Update failed, I was not able to boot my laptop. It would hang with the HP Logo and spinning circle at the point when the Boot Manager normally starts up Windows. Trying to do a recovery reported a failure, but no specific reason
except to say boot failed and that a Restart might correct the error, but it would just hang on the HP Logo every time I would try to boot. I reinstalled the Windows 8.1 Pro OS and the laptop was working fine until I would install Hyper-V.
I have gone thru this sequence 3 times. The first time, I pulled the latest Windows Updates, then installed Hyper-V, IIS and some other components and after this install required a Restart, my laptop hung at the HP Logo. The second time, I did not enable
any Windows Updates, but installed Hyper-V and IIS and again, after the Restart my laptop hung. So, the final time, I only installed Hyper-V and after the Restart, my laptop hung once again.
Since Hyper-V used to work, it would not seem to make sense that I have a hardware compatibility problem. I have also run the extensive built in firmware Disk tests and other diagnostics taking several hours to complete and these all passed.
I am now using my laptop without Hyper-V and it is working fine, but I hoping to find a reason/solution for the problem caused by installing Hyper-V so that I can once again install and use it.

Hi,
Generally speaking, when you add feature like Hyper-V, system would take a long time to get this feature configured. if your computer still stay updates configuration steps, you can use Windows 8.1 installation image to repair system. In system repair mode,
you can access into Command Prompt mode, and check CBS.log which located at C:\Windows\logs\CBS. This log file would record Windows installation process, we may find the problem of Hyper-V stallation.
Roger Lu
TechNet Community Support

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Hi Necrolog,
Welcome to the hp forums.Thank you for your query.
Could you please follow the steps in the link and ensure Hyper V is enabled in BIOs by pressing F10 before startup screen.
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I am a HP Employee.
The opinions expressed here are my personal opinions, not of HP.
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Corrupt SPLDR.SYS Windows 8.1 Pro 64-bit won't boot

Hi!
I'm running Windows 8.1 Pro 64-bit full Norwegian version bought at a local store. My PC consists of:
MB: Asrock Z97 Extreme4
Proc.: Intel i7 4790
RAM: 4 x 8 GB Crucial Ballistix Sport 1866Mhz 10CL
Video: Gainward GeForce GTX 770 4GB
SSD: Kingston HyperX SH100S3 240GB (system disk)
RAID5: 3 x Seagate Barracuda 7200.12 1TB + 1 x Seagate Barracuda 7200.11 1TB(configured using Intel RAID BIOS utility - only used for user files)
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The optical drives are connected to the onboard ASMedia ASM1061 controller, the others to connectors controlled by the Intel Z97 chipset. I also have an M-AUDIO Firewire Solo external sound card connected to the 1394a expansion card. This is powered
by the Firewire bus and is occasionally a little "tricky". I believe it's because there is no driver available for Win 8 so I had to use the one for Win 7 64-bit.
This rig was set up about a month ago and has worked without any
serious problems except that I sometimes experience that the eSATA drive doesn't always wake from sleep.
All suggested updates has been installed.
My issue is this:
2 days ago I was installing a Silverlight
plug-in for Mozilla when I got a message that the installation routine couldn't update the registry and then the system
froze. After rebooting,
I was informed that Windows had become
corrupt. Attempting to run the
repair routine was no use - I just got
a message that Windows couldn't undertake
the repair. I suspected problems
with the system disk and started the
command prompt using the installation DVD.
It turned out that the C drive suddenly
had becomeE drive. The RAID "disk" showed up under the command prompt as C:\.
I ran bootrec (Sorry, I can't remember what parameter I used)
that reported that some errors were
repaired but that it couldn't repair everything.
Then I ran sfc offline.
In the srttrail.txt log file (that was written to the correct path on the E drive) I see that
SPLDR.SYS is corrupt and attempt
to repair failed (error code 0x2
and 0x490).
I was advised by a support engineer on the Microsoft Community forum to try and run chkdsk /p - which turned out to be an invalid parameter - and chkdsk /r which reported that everything was OK.
The support engineer suggested that I should perform a system restore from WindowsRE. This is what happened:
At first there seemed to be only one restore point available dated two days earlier but when I looked for more restore points there were 4 alltogether the oldest one dated 14 days earlier. I klicked the button "Look for the
affected programs" (or something like that - I've translated this from the Norwegian version I use.) and there were listed a lot of programs and utilities that had been installed on this disk before but not as long as it had been in
this rig! (I used this SSD as system disk in another PC earlier.) This is strange: when I installed the disk in my new rig I chose to repartition it and as far as I know that means that old data is erased. OK, I chose the newest restore point anyway
and klicked Next. In the following dialog there was a yellow exclamation mark and a list of two drives. Both drives were called Local drive (C:), the first one with (System) as well. Under Status on this first one it said "You
must enable system protection on this drive." Status of the second one was "Cannot find the drive" (Again translated from the Norwegian version.) The checkbox to the left
of both of the listings were greyed out and because I couldn't choose any of them, the Next-button was grayed out as well.
As I mentioned before the drives have chanched letters. When I use old DOS commands from the command prompt and switch from the X: drive (which seems to be the Windows installation DVD) to C: it shows the RAID I mentioned before. Likewise, the
system disk (i.e. the SSD I'm having trouble with) is now D:. And that sort of explains why the system recovery can't find the drive... But it doesn't explain why the old programs show up in the new restore points... (I've checked that the SSD
still is set to be boot disk in UEFI.)
The support engineer suggested that I post my query on the TechNet forum.
Do you have any suggestions what to do?
I'm a little nervous considering what could happen
with the files on the data disk if I make a mistake... :-)
Regards,
Morten Ericson

Hi!
Please read both this reply and the next one in conjunction.
I've done some research on my own after following your advices (Please look at my last reply below.).
First of all: bootrec /scanos does not report any Windows installations.
Running bcdedit /enum reports:
Windows Boot Manager
identifier: {bootmgr}
device: partition=D:
path: \bootmgr
description: Windows Boot Manager
locale: nb-NO
default: {default}
displayorder: {default}
timeout: 30
Windows Boot Loader
identifier: {default}
device: partition=D:
path: \Windows\system32\winload.exe
description: Windows 7 Ultimate
locale: nb-NO
recoverysequence: {db9ccd8a-43de-11e4-85a8-8169ad6c7c9f}
recoveryenabled: Yes
osdevice: partition=D:
systemroot: \Windows
bootmenupolicy: Standard
I must admit that I don't know how these things go together but there are a few things that makes me wonder:
First of all this has to be the reason why Windows 7 Ultimate comes up as the only option when I try to run System Restore. But is it really a Windows 7 installation? A lot of the files (logs and so on) in the Windows folder and subfolders are dated
mid August when I installed Windows 8.1. I just wonder...
I've been googling a bit about system installation and recovery and I read somewhere that there are some special precautions when installing Windows on a UEFI-based system. I can not remember that there were any options or warnings about that when
I installed Windows 8.1 on my system. But I belive I saw somewhere that a UEFI-based installation creates other partitions than an installation on an ordinary BIOS based system. The fact that the SSD has been used in a BIOS based system with Windows
7 Ultimate before explains in my mind why there is no reserved partition.
BTW: I don't know if this is important but the strings that were reported by the bootsect command were {e59cd65f-170a-42c4-927d-8ce8a94989a3} for the C:-disk and {cf240c96-43dc-11e4-85a8-806e6f6e6963} for the D:-disk.
Regards,
Morten

Can't install Hyper-V on Windows 8.1 Pro

I have a Dell XPS L702x laptop with 2 hard drives, one of them has a MBR partition and has Hyper-V running without problems, but in the second drive, which is a SSD disk and has a GPT partition, I can't install it. It seems to install, gets to about 95%
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I have tried the following commands:
DISM.exe /Online /Cleanup-Image /ScanHealth
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Sfc /scannow
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(c) 2013 Microsoft Corporation. All rights reserved.
C:\>coreinfo -v
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Sysinternals - www.sysinternals.com
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Can you clarify what you're trying to do as it's unclear to me? You've got a laptop with two drives, and you've already got Hyper-V installed on the laptop, and you're now trying to install it on the other drive?
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More information:
Client Hyper-V
Bringing Hyper-V to “Windows 8”
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