Como reparar arquivos de sistema corrompidos de um disco de instalação ou manual

Question

Estou usando o Windows 8.1 x64, compilação 6.3.9600.17031, usando o Prompt de Comando com privilégios de administrador.

sfc /scannow

retorna:

...found corrupt files but was unable to fix some of them.

e

dism /online /cleanup-image /restorehealth

retorna:

Error: 0x800f0906
The source files could not be downloaded.

(e o Serviço Windows Update não consegue iniciar porque esses arquivos estão faltando.)

também tentou

dism /online /cleanup-image /restorehealth /source:wim:F:\sources\install.wim:1 /limitaccess

e retornou:

Version: 6.3.9600.17031
Image Version: 6.3.9600.16384
Error: 0x800f081f
The source files could not be found.

Eu montei a imagem e tentei de lá.

dism /mount-image /imagefile:F:\sources\install.wim /index:1 /mountdir:C:\offline

dism /online /cleanup-image /restoreHealth /source:c:\offline /limitaccess

também retornando:

Error: 0x800f081f

Então eu filtrou os detalhes de CBS.log para sfc.txt com código abaixo,

findstr /i /c:"[SR]" "%windir%\Logs\CBS\CBS.log" | findstr /i /v /c:"verify" > "%userprofile%\Desktop\sfc.txt"

e o log filtrado é:

2015-04-13 17:07:53, Info                  CSI    0000004b [SR] Cannot repair member file [l:30{15}]"ISymWrapper.dll" of ISymWrapper, Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope neutral, PublicKeyToken = {l:8 b:b03f5f7f11d50a3a}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch
2015-04-13 17:07:58, Info                  CSI    0000004d [SR] Cannot repair member file [l:30{15}]"ISymWrapper.dll" of ISymWrapper, Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope neutral, PublicKeyToken = {l:8 b:b03f5f7f11d50a3a}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch
2015-04-13 17:07:58, Info                  CSI    0000004e [SR] This component was referenced by [l:162{81}]"Microsoft-Windows-NetFx2-OC-Package~31bf3856ad364e35~amd64~~6.3.9600.16384.NetFx2"
2015-04-13 17:07:58, Info                  CSI    00000051 [SR] Could not reproject corrupted file [ml:520{260},l:102{51}]"\??\C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727"\[l:30{15}]"ISymWrapper.dll"; source file in store is also corrupted
2015-04-13 17:09:27, Info                  CSI    0000005c [SR] Cannot repair member file [l:20{10}]"uireng.dll" of Microsoft-Windows-Application-Compatibility-UI-Recording, Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch
2015-04-13 17:09:41, Info                  CSI    00000061 [SR] Cannot repair member file [l:20{10}]"uireng.dll" of Microsoft-Windows-Application-Compatibility-UI-Recording, Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch
2015-04-13 17:09:41, Info                  CSI    00000062 [SR] This component was referenced by [l:330{165}]"Microsoft-Windows-Client-Features-Package-AutoMerged-base~31bf3856ad364e35~amd64~~6.3.9600.16384.Microsoft-Windows-Client-Features-Package-AutoMerged-base-Deployment"
2015-04-13 17:09:41, Info                  CSI    00000065 [SR] Could not reproject corrupted file [ml:520{260},l:46{23}]"\??\C:\WINDOWS\System32"\[l:20{10}]"uireng.dll"; source file in store is also corrupted
2015-04-13 17:10:05, Info                  CSI    00000087 [SR] Cannot repair member file [l:24{12}]"chs_boot.ttf" of Microsoft-Windows-BootEnvironment-Core-Fonts-CHS-Boot, Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch
2015-04-13 17:10:05, Info                  CSI    00000089 [SR] Cannot repair member file [l:24{12}]"jpn_boot.ttf" of Microsoft-Windows-BootEnvironment-Core-Fonts-JPN-Boot, Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch
2015-04-13 17:10:10, Info                  CSI    0000008b [SR] Cannot repair member file [l:24{12}]"jpn_boot.ttf" of Microsoft-Windows-BootEnvironment-Core-Fonts-JPN-Boot, Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch
2015-04-13 17:10:10, Info                  CSI    0000008c [SR] This component was referenced by [l:350{175}]"Microsoft-Windows-Client-Features-Package-AutoMerged-minkernel~31bf3856ad364e35~amd64~~6.3.9600.16384.Microsoft-Windows-Client-Features-Package-AutoMerged-minkernel-Deployment"

no final disso, é Hash Mismatch

Como faço para reparar os arquivos corrompidos do sistema?

Posso dizer ao DISM para usar o disco de instalação do Windows como fonte?