Reinstalling Hyper-V fails Windows 8.1

Question

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

Answer 1

Hi, 
Would you please provide some more background for the issue you experienced? Do you mean the Virtual switch on the 8.1 hyper-V machine don't work? 
Which type of the switch did you used? External, Internal or Private? How did you know the virtual switch don't work? Any error message on the screen? 
Best Regards,
Jason Zeng
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