Windows Check for updates keeps running-all installation/updates fail

Unless I specifically say that commands need to be separated, copy/pasting the list is fine (and a lot quicker than attempting to retype them yourself! )

OK - we need to create a new registry Key, but I suspect that the first attempt will fail (but if it works, it's a loss of hassle avoided!)

Please open an Elevated Command Prompt, and run the following commands (Use copy/paste - there's only three commands!)

REG ADD "HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\Version"
REG ADD "HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\Version" /v 6.1.7600.16385 /t REG_EXPAND_SZ /d %SystemRoot%\winsxs\amd64_microsoft-windows-trustedinstaller_31bf3856ad364e35_6.1.7600.16385_none_ed02252b66d7bca2
REG QUERY "HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\Version"

Post the results.
then reboot, and run the following commands in an Elevated Command Prompt window - post the results in another reply.

REG QUERY "HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\Version"
NET START TRUSTEDINSTALLER

Like I said, that was to be expected.:)
I was hoping that we wouldn't need to go into Regedit ( I always avoid it if possible, it's all too easy to make a total mess, and there's no Undo option)

First, try creating a System Restore point

Then open Regedit (Click on the Start button, and in the Search box, type REGEDIT and hit the Enter key - accept the UAC prompt)
Navigate to the
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing
key.
right-click on the key, and select Permissions
Click on the Advanced button
Click on the Owner tab
Highlight Administrators in the box
Click on Apply
Click on the Permissions tab
Highlight the Administrators entry
Click on the Edit button
Put a tick in the Full Control/Allow box - this should put ticks in all the other boxes in the column.
Click OK out (3 times)
close Regedit

Now run these commands again in an Elevated Command Prompt window, and post the results......

REG ADD "HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\Version"
REG ADD "HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\Version" /v 6.1.7600.16385 /t REG_EXPAND_SZ /d %SystemRoot%\winsxs\amd64_microsoft-windows-trustedinstaller_31bf3856ad364e35_6.1.7600.16385_none_ed02252b66d7bca2
REG QUERY "HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\Version"

No point - go straight to #83

Please post the CBS.log - it should give some clues what's happening.

PLease also post eh results of this query...

REG QUERY "HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\Version"

That CBS.log file was last updated on 25th Feb!
Please post the current one from the C:\Windows\Logas\CBS folder

Having said that - there were some errors in the SFC scan you ran that month...

Code:

 Line 10453: 2015-02-25 17:35:24, Info                  CSI    000000ef [SR] Cannot repair member file [l:22{11}]"charmap.exe" of Microsoft-Windows-charmap, Version = 6.1.7601.18648, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
Line 12147: 2015-02-25 17:39:23, Info                  CSI    0000023e [SR] Cannot repair member file [l:24{12}]"WsmWmiPl.dll" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12149: 2015-02-25 17:39:23, Info                  CSI    00000240 [SR] Cannot repair member file [l:38{19}]"WSManHTTPConfig.exe" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12151: 2015-02-25 17:39:23, Info                  CSI    00000242 [SR] Cannot repair member file [l:20{10}]"WsmSvc.dll" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12153: 2015-02-25 17:39:23, Info                  CSI    00000244 [SR] Cannot repair member file [l:48{24}]"WSManMigrationPlugin.dll" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12155: 2015-02-25 17:39:23, Info                  CSI    00000246 [SR] Cannot repair member file [l:22{11}]"WsmAuto.dll" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12795: 2015-02-25 17:41:58, Info                  CSI    000002ec [SR] Cannot repair member file [l:24{12}]"WsmWmiPl.dll" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 (10), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12796: 2015-02-25 17:41:58, Info                  CSI    000002ed [SR] Cannot repair member file [l:38{19}]"WSManHTTPConfig.exe" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 (10), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12797: 2015-02-25 17:41:58, Info                  CSI    000002ee [SR] Cannot repair member file [l:20{10}]"WsmSvc.dll" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 (10), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12798: 2015-02-25 17:41:58, Info                  CSI    000002ef [SR] Cannot repair member file [l:48{24}]"WSManMigrationPlugin.dll" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 (10), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12799: 2015-02-25 17:41:58, Info                  CSI    000002f0 [SR] Cannot repair member file [l:22{11}]"WsmAuto.dll" of Microsoft-Windows-Web-Services-for-Management-Core, Version = 6.1.7601.18619, pA = PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 (10), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing
 Line 12918: 2015-02-25 17:42:13, Info                  CSI    0000031a [SR] Cannot repair member file [l:22{11}]"charmap.exe" of Microsoft-Windows-charmap, Version = 6.1.7601.18648, pA = PROCESSOR_ARCHITECTURE_INTEL (0), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing

I'll post a fix protocol for those, if I I haven't heard by the time I get to it!