Install of Hyper-V role fails Server 2012 Standard

Hi All,

I have been trying to enable the Hyper-V role in server 2012R2 standard, but on restarting it fails to install, then recovers back to how it was. I've looked through the logs and found the following.

In the Setup Event log

Update Microsoft-Hyper-V-Offline of package Microsoft-Hyper-V-ServerEdition-Package failed to be turned on. Status: 0x800f0922.

In the CBS.log.

2014-09-04 20:52:39, Info                  CSI    000000c7 Begin executing advanced installer phase 50 (0x00000032) index 0 (sequence 0)
    Old component: [l:0]""
    New component: [l:0]""
    Install mode: delta
    Installer ID: {d4486727-4d36-45a5-bc81-b8935aed1429}
    Installer name: [27]"Ngen Task Scheduler Tickler"
2014-09-04 20:52:39, Info                  CSI    000000c8@2014/9/4:19:52:39.526 Executing Process [76]"C:\Windows\Microsoft.NET\Framework\v4.0.30319\Ngen.exe  Update /Queue /Delay"
2014-09-04 20:52:39, Info                  CSI    000000c9@2014/9/4:19:52:39.620 Executing Process [78]"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Ngen.exe  Update /Queue /Delay"
2014-09-04 20:52:39, Info                  CSI    000000ca@2014/9/4:19:52:39.651 CSI Advanced installer perf trace:
CSIPERF:AIDONE;{d4486727-4d36-45a5-bc81-b8935aed1429};(null);171720us
2014-09-04 20:52:39, Info                  CSI    000000cb End executing advanced installer (sequence 0)
    Completion status: S_OK 

2014-09-04 20:52:39, Info                  CSI    000000cc Begin executing advanced installer phase 50 (0x00000032) index 0 (sequence 0)
    Old component: [l:0]""
    New component: [l:0]""
    Install mode: uninstall
    Installer ID: {4006c604-9280-4d68-b731-2fe3d02e84bf}
    Installer name: [16]"Shortcut Tickler"
2014-09-04 20:52:39, Info                  CSI    000000cd@2014/9/4:19:52:39.651 CSI Advanced installer perf trace:
CSIPERF:AIDONE;{4006c604-9280-4d68-b731-2fe3d02e84bf};(null);101us
2014-09-04 20:52:39, Info                  CSI    000000ce End executing advanced installer (sequence 0)
    Completion status: S_OK 

2014-09-04 20:52:39, Error                 CBS    Startup: Failed to process advanced operation queue, startupPhase: 0.  A rollback transaction will be created. [HRESULT = 0x800f0922 - CBS_E_INSTALLERS_FAILED]
2014-09-04 20:52:39, Info                  CBS    Setting ExecuteState key to: CbsExecuteStateInitiateRollback | CbsExecuteStateFlagAdvancedInstallersFailed
2014-09-04 20:52:39, Info                  CBS    SetProgressMessage: progressMessageStage: -1, ExecuteState: CbsExecuteStateInitiateRollback | CbsExecuteStateFlagAdvancedInstallersFailed, SubStage: 0
2014-09-04 20:52:39, Info                  CBS    Progress: UI message updated. Operation type: Foundation. Stage: 1 out of 1. Rollback.
2014-09-04 20:52:39, Info                  CBS    Setting original failure status: 0x800f0922, last forward execute state: CbsExecuteStateResolvePending
2014-09-04 20:52:40, Info                  CSI    000000cf Rolling back transactions...

Any ideas on this would be much appreciated.

Kind Regards

Richard