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Basically after I add the role in the server manager and restart for the first time, the progress bar fills and after that I'm informed that installation failed and that computer is reverting the process. After that it reboots by itself and one progress bar later I can log in. After that I'm taken back to the server manager which shows me the exact same screen which I had before the restart.

After several cycles, the server manager won't start and I can leave the loop, but that doesn't solve my problem with Hyper-V installation.

And if it matters, yes I have hardware support for virtualization and it works fine in other virtual machines.

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Do the Event Logs report any warnings or errors? How about any messages or errors codes reported by the Server Manager when it tells you it failed? – Ƭᴇcʜιᴇ007 Jan 22 '12 at 18:19
@techie007 I get Update Microsoft-Hyper-V-Management-Clients of package Microsoft-Hyper-V-Management-Clients-Package failed to be turned on. Status: 0x80004005. and Update Microsoft-Hyper-V of package Microsoft-Hyper-V-Package failed to be turned on. Status: 0x80004005. as information in event log. Server Manager shows no errors (and reports installation success in event log). During start, there is no error message number. – AndrejaKo Jan 22 '12 at 18:34
If you hadn't figured it out already: 0x80004005 is a Access Denied error. Are you running any other virtualization software on that server? – Ƭᴇcʜιᴇ007 Jan 22 '12 at 18:40
@techie007 No. It's a clean install with just the drivers. – AndrejaKo Jan 22 '12 at 18:43
Interesting. :) If it's clean with just drivers: Have you ensured all drivers are installed and up-to-date? Have you retried the OS install from scratch? Have you done disk and file-system checks? Can you clarify what "it works fine in other virtual machines" means? What 'other virtual machines'? This 2008 R2 is a host OS right? :) – Ƭᴇcʜιᴇ007 Jan 22 '12 at 18:48

The article Installing Hyper-V on Windows Server 2008 R2 details two more methods for installing it, besides via the GUI :

Using the Command Prompt

Open a Command Prompt window with elevated permissions and enter either of :

servermanagercmd -i Hyper-V
servermanagercmd -i Hyper-V -restart

Using PowerShell

Open a PowerShell window and type :

Import-Module servermanager

then either of:

Add-WindowsFeature Hyper-V
Add-WindowsFeature Hyper-V -restart

If neither of these methods works, then my only suggestion is to clean-install Server 2008 and try again.

If it still does not work, then your motherboard is maybe unsuitable to support Hyper-V.

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