UPDATE:
I downloaded and ran your SFCFix tool. The log is pasted below. It didn't resolve the remaining issues. CBS file is too large to attach, you can access it here:
CBS.zip
Many thanks.
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SFCFix version 3.0.2.1 by niemiro.
Start time: 2020-03-18 11:24:50.312
Microsoft Windows 7 Service Pack 1 - amd64
Not using a script file.
AutoAnalysis::
WARNING: Failed to get store name from identity name with return code 2 for component NetFx-MSCORSVC__DLL and file mscorsvc.dll. File is reported as corrupt by SFC.
CORRUPT: mscorsvc.dll of component NetFx-MSCORSVC__DLL.
WARNING: Failed to get store name from identity name with return code 2 for component NetFx-MSCORSVC__DLL and file mscorsvc.dll. File is reported as corrupt by SFC.
CORRUPT: mscorsvc.dll of component NetFx-MSCORSVC__DLL.
WARNING: Failed to get store name from identity name with return code 2 for component prnsa002.inf and file Amd64\sml257.gpd. File is reported as corrupt by SFC.
CORRUPT: Amd64\sml257.gpd of component prnsa002.inf.
CORRUPT: C:\Windows\winsxs\amd64_netfx-system.data.sqlxml_b03f5f7f11d50a3a_6.1.7601.23989_none_fd5407d03d533a74\System.Data.SqlXml.dll
CORRUPT: C:\Windows\winsxs\amd64_netfx-system.security_b03f5f7f11d50a3a_6.1.7601.24113_none_1ab7b249b3a3fe33\System.Security.dll
CORRUPT: C:\Windows\winsxs\amd64_netfx-system.xml_b03f5f7f11d50a3a_6.1.7601.23989_none_4a8ab9ca55cbec5c\System.XML.dll
CORRUPT: C:\Windows\winsxs\msil_system.data.sqlxml_b77a5c561934e089_6.1.7601.23989_none_ef0d83187b44b3c7\System.Data.SqlXml.dll
CORRUPT: C:\Windows\winsxs\msil_system.security_b03f5f7f11d50a3a_6.1.7601.24113_none_5995e0f4a48bc0b8\System.Security.dll
CORRUPT: C:\Windows\winsxs\msil_system.xml_b77a5c561934e089_6.1.7601.23989_none_3f356ede1f97c84f\System.XML.dll
SUMMARY: Some corruptions could not be fixed automatically. Seek advice from helper or sysnative.com.
CBS & SFC total detected corruption count: 9
CBS & SFC total unimportant corruption count: 0
CBS & SFC total fixed corruption count: 0
SURT total detected corruption count: 802
SURT total unimportant corruption count: 0
SURT total fixed corruption count: 0
AutoAnalysis:: directive completed successfully.
Successfully processed all directives.
Failed to generate a complete zip file. Upload aborted.
SFCFix version 3.0.2.1 by niemiro has completed.
Currently storing 0 datablocks.
Finish time: 2020-03-18 11:42:58.455
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