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Erreur 0x80070005 : Accès refusé au premier démarrage d'Hyper-V dans Windows 10 Pro

ayi

I’m trying to run Hyper-V on a freshly installed Windows 10 Pro (1709) on AMD FX 6350, 8 GB RAM. 
Hyper-V Virtual Machine Management (vmms) starts properly but Hyper-V Host Compute Service (vmcompute) crashes with the error <code>Windows could not start the Hyper-V Host Compute Service on Local Computer. Error 0x80070005: Access is denied.</code>
In the log only meaningless message <code>The Hyper-V Host Compute Service service terminated with the following error: General access denied error</code>.
Googling finds a similar error when migrating or exporting virtual machines, but not the first time Hyper-V starts with no VMs are created.
Previously, this hardware was Windows 7 and Vmware Player worked fine. Now I want to try “native” virtualization.
By the way, exactly the same problem on the laptop on Intel i5-2430M.
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Source : <a href="https://developercommunity.visualstudio.com/content/problem/136952/mfc-ribbon-slow-on-first-loadshow.html" rel="noopener nofollow ugc">Server Fault</a>

ayi_2

This is known to be caused by disabling Windows <code>Control flow guard (CFG)</code>.
To turn this back on:
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Search for and open <code>Windows Defender Security Center</code> on the start menu.
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Go into <code>App & browser control</code>:
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Scroll to the bottom and click on <code>Exploit protection settings</code>:
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Ensure that <code>Control flow guard (CFG)</code> is set to <code>On by default</code>:
This morning my Hyper-V was working, then this evening it wasn’t. Disabling CFG was the only noteworthy activity I had done on Windows aside from regular application use. After re-enabling the feature, Hyper-V was working again for me.
I disabled the feature in the first place due to <a href="https://developercommunity.visualstudio.com/content/problem/136952/mfc-ribbon-slow-on-first-loadshow.html">an issue with Windows 10 build 1709</a> which is severely impacting my TortoiseGit performance in that the diff tool takes about 5 seconds to open.
Another users <a href="https://developercommunity.visualstudio.com/content/problem/136952/mfc-ribbon-slow-on-first-loadshow.html#reply-169325">comment on that page</a> reports the same problem.