How to analyze SFC /scannow logs

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Sfc /scannow will inspect all of the important Windows files on your computer, including Windows DLL files. If System File Checker finds an issue with any of these protected files, it will replace it.
You can find the sfc logs inside CBS.log under C:\Windows\logs\CBS\ folder.
There will be a lot of entries in cbs logs. You can filter out the log for SFC by running the below command.

 findstr /c:"[SR]" cbs.log > sfcdetails.txt

The above command will search for the string [SR] and if it found , then it copies the corresponding entry in to the sfcdetails.txt

Below is sample text extracted from CBS log by using the above command
-----------------------------------------------------------------------------------------------------------
2013-06-24 12:55:44, Info                  CSI    00000210 [SR] Verify complete
2013-06-24 12:55:44, Info                  CSI    00000211 [SR] Verifying 100 (0x00000064) components
2013-06-24 12:55:44, Info                  CSI    00000212 [SR] Beginning Verify and Repair transaction
2013-06-24 12:55:48, Info                  CSI    00000214 [SR] Verify complete
2013-06-24 12:55:48, Info                  CSI    00000215 [SR] Verifying 100 (0x00000064) components
2013-06-24 12:55:48, Info                  CSI    00000216 [SR] Beginning Verify and Repair transaction
2013-06-24 12:55:53, Info                  CSI    00000218 [SR] Verify complete
2013-06-24 12:55:54, Info                  CSI    00000219 [SR] Verifying 88 (0x00000058) components
2013-06-24 12:55:54, Info                  CSI    0000021a [SR] Beginning Verify and Repair transaction
2013-06-24 12:55:57, Info                  CSI    0000021c [SR] Verify complete
2013-06-24 12:55:57, Info                  CSI    0000021d [SR] Repairing 1 components
2013-06-24 12:55:57, Info                  CSI    0000021e [SR] Beginning Verify and Repair transaction
2013-06-24 12:55:57, Info                  CSI    00000220 [SR] Cannot repair member file [l:24{12}]"PhotoAcq.dll" of Microsoft-Windows-PhotoAcquire, Version = 6.1.7600.16385, pA = PROCESSOR_ARCHITECTURE_INTEL (0), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch
2013-06-24 12:55:57, Info                  CSI    00000222 [SR] Cannot repair member file [l:24{12}]"PhotoAcq.dll" of Microsoft-Windows-PhotoAcquire, Version = 6.1.7600.16385, pA = PROCESSOR_ARCHITECTURE_INTEL (0), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch2013-06-24 12:55:57, Info                  CSI    00000223 [SR] This component was referenced by [l:178{89}]"Microsoft-Windows-PhotoBasicPackage~31bf3856ad364e35~x86~~6.1.7600.16385.PhotoBasicUpdate"
2013-06-24 12:55:57, Info                  CSI    00000226 [SR] Could not reproject corrupted file [ml:520{260},l:82{41}]"\??\C:\Program Files\Windows Photo Viewer"\[l:24{12}]"PhotoAcq.dll"; source file in store is also corrupted
2013-06-24 12:55:57, Info                  CSI    00000228 [SR] Repair complete
2013-06-24 12:55:57, Info                  CSI    00000229 [SR] Committing transaction
2013-06-24 12:55:57, Info                  CSI    0000022d [SR] Verify and Repair Transaction completed. All files and registry keys listed in this transaction  have been successfully repaired
---------------------------------------------------------------------------------------------------------------------------------

From the above log you can see that there are only entries with [SR] line which is generated by sfc. There are some entries by sfc where sfc cannot repair some of the dll files which is highlighted above. Here in this case PhotoAcq.dll was not repaired by sfc. We can resolve this issue by copying the same dll file from a working machine and replacing it.

In few cases you may have to copy the file into C:\Windows\winsxs or C:\Windows\servicing, where you may not have permission to copy the file. You can take ownership and give full permission to the location by running the below commands.

takeown /f C:\Windows\winsxs\folder or file name where you want to take ownership

icacls C:\Windows\winsxs\folder or file name  /grant Administrators:F

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