How many files are listed as "missing" in CBS.log? If they are limited to a limited number (10 or 20). You may try to manually reinstall them, otherwise I suspect you got some unuexpected failure in the windows update, but I need some other info like Windows Event Viewer.
In any case this is the "MANUAL" procedure.
Manually download any of KBxxxx update from Microsoft site (example: Windows6.1-KB974455-x64.msu)
(do not confuse Windows6.1-KBxxxxx-x64 with Windows6.1-KBxxxxx-x86 !!!)
Manually extract msu files into local directory: It will generate at laest one xml file and 1 .cab files
Manually extract files from .CAB (cabinet files): you will find the files as named in the CBS.log
That's all, just recover files from such temporary location
Example with KB978207
cd /d d:\tmp2
expand -F:* D:\tmp2\Windows6.1-KB978207-x64.cab D:\tmp2\files
cd /d D:\tmp2\files
Now, recover files:
copy *.mum C:\Windows\servicing\Packages
copy *.cat C:\Windows\servicing\Packages
Repeat for all KBxxxx file missing like your KB974455. Disable antivirus software if any.