Reinstalling Hyper-V fails Windows 8.1

Hi All,

Had some issues with virtual switch, it never worked. Tried to enable/disable hyper-v.

Pretty much does not install anymore. Maybe some of you have an idea.

Here output from CBS.log based on it seems the virtual switch part is failing, but no idea why exactly:

2014-12-26 01:32:15, Info                  CSI    000000c4 Begin executing advanced installer phase 38 (0x00000026) index 180 (0x00000000000000b4) (sequence 219)
    Old component: [l:0]""
    New component: [ml:318{159},l:316{158}]"Microsoft-Hyper-V-Drivers-VmSwitch, Culture=neutral, Version=6.3.9600.17401, PublicKeyToken=31bf3856ad364e35, ProcessorArchitecture=amd64, versionScope=NonSxS"
    Install mode: install
    Installer ID: {81a34a10-4256-436a-89d6-794b97ca407c}
    Installer name: [15]"Generic Command"
2014-12-26 01:32:15, Info                  CSI    000000c5 Performing 1 operations; 1 are not lock/unlock and follow:
  (0)  LockComponentPath (10): flags: 0 comp: {l:16 b:242611049b20d001720000009804c004} pathid: {l:16 b:242611049b20d001730000009804c004} path: [l:226{113}]"\SystemRoot\WinSxS\amd64_microsoft-hyper-v-drivers-vmswitch_31bf3856ad364e35_6.3.9600.17401_none_5a1d032e53d5da20" pid: 498 starttime: 130640239192515300 (0x01d0209afa7122e4)
2014-12-26 01:32:15, Info                  CSI    000000c6 Calling generic command executable (sequence 1): [30]"C:\WINDOWS\System32\netcfg.exe"
    CmdLine: [51]""C:\WINDOWS\System32\netcfg.exe" -e -c s -i VMS_VSF"
2014-12-26 01:32:15, Info                  CSI    000000c7 Done with generic command 1; CreateProcess returned 0, CPAW returned S_OK
    Process exit code 0 resulted in success? TRUE
    Process output is throttled for successful Generic Commands
2014-12-26 01:32:15, Info                  CSI    000000c8 Calling generic command executable (sequence 2): [30]"C:\WINDOWS\System32\netcfg.exe"
    CmdLine: [50]""C:\WINDOWS\System32\netcfg.exe" -e -c p -i VMS_PP"
2014-12-26 01:32:16, Info                  CBS    Progress: UI message updated. Operation type: Foundation. Stage: 1 out of 1. Percent progress: 95.
2014-12-26 01:32:16, Info                  CBS    Winlogon: TiCoreOnCreateSession has been called
2014-12-26 01:32:19, Info                  CSI    000000c9 Performing 1 operations; 1 are not lock/unlock and follow:
  (0)  LockComponentPath (10): flags: 0 comp: {l:16 b:4ef075069b20d001740000009804c004} pathid: {l:16 b:4ef075069b20d001750000009804c004} path: [l:234{117}]"\SystemRoot\WinSxS\x86_microsoft.windows.s..ation.badcomponents_31bf3856ad364e35_6.3.9600.16384_none_cd3183f2deb856d2" pid: 498 starttime: 130640239192515300 (0x01d0209afa7122e4)
2014-12-26 01:32:19, Info                  CSI    000000ca Creating NT transaction (seq 3), objectname [6]"(null)"
2014-12-26 01:32:19, Info                  CSI    000000cb Created NT transaction (seq 3) result 0x00000000, handle @0x320
2014-12-26 01:32:19, Info                  CSI    000000cc@2014/12/25:23:32:19.415 Beginning NT transaction commit...
2014-12-26 01:32:19, Info                  CSI    000000cd@2014/12/25:23:32:19.431 CSI perf trace:
CSIPERF:TXCOMMIT;15069
2014-12-26 01:32:19, Error                 CSI    000000ce (F) Done with generic command 2; CreateProcess returned 0, CPAW returned S_OK
    Process exit code 5 resulted in success? FALSE
    Process output: [l:73 [73]"Trying to install VMS_PP ...




... failed. Error code: 0x80070005.




"][gle=0x80004005]
2014-12-26 01:32:19, Info                  CSI    000000cf Calling generic command executable (sequence 3): [30]"C:\WINDOWS\System32\netcfg.exe"
    CmdLine: [51]""C:\WINDOWS\System32\netcfg.exe" -e -c p -i VMS_VSP"
2014-12-26 01:32:19, Info                  CSI    000000d0 Done with generic command 3; CreateProcess returned 0, CPAW returned S_OK
    Process exit code 0 resulted in success? TRUE

If you have some ideas please let me know.

Thanks,

jb