Windows 8.1 pro hyper-v issue

I have a Windows 8.1 pro machine and I am trying to turn on the hyper-v.
I checked the system requirement and it is good.
But every time I am trying to turn on, the system reboots and it says "working on adding features" then it says "couldn't add feature, undoing changes".
And when I check it back it is off.
romeiovasuAsked:
Who is Participating?
 
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Right click on computer and Manage.

Or: Start --> Compmgmt.msc [Ctrl+Shft+Enter}
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Make sure the virtualization acceleration features are enabled in the BIOS.

How was the OS installed? Original OEM image or via flash drive?
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romeiovasuAuthor Commented:
I checked the bios and it says CPU-VT is supported.
The OS was installed from a flash drive

Thanks
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Insert the flash drive into the same USB port and try the role install again. You may need to select the option to "choose installation source" in the dialogue box and set the flash drive as your source.
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romeiovasuAuthor Commented:
I am not quite sure "try the role install again" mean.
if you can explain it in more details, this will be great
Thanks
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Hyper-V is a Role in Windows. So, plug in the USB drive and go through and Add Windows Feature choosing Hyper-V. :)
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romeiovasuAuthor Commented:
got it thanks :-)
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romeiovasuAuthor Commented:
It seems there something is preventing it from completing the installation process.
once it reaches %93 it starts rolling back.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Is the machine up to date?
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romeiovasuAuthor Commented:
should be!
I am checking it again
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romeiovasuAuthor Commented:
Now, we are up to date!
do you want try again?
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romeiovasuAuthor Commented:
I tried again and I am still getting the same issue!
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
There should be some Event Log entries that could indicate the source of the problem?
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romeiovasuAuthor Commented:
Do know where I can find it?
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