What I meant by that was that the Cat and Mum file replacement section has been closed.
A sfc /scannow won't replace manifest files and while a dism /scanhealth cmd will usually complete in Win 7, it doesn't tell you anything and the /restorehealth cmd returns an error 87.
Did you get an install disk and product key from the people who built your machine ?
It's possible to perform a repair install on an OEM build with a Win 7 install disk that includes SP1 but you would still need the product key to activate it.
Belarc Advisor should give you the 5x5, 25 character alphanumeric key but it would be better to get that and a copy of the install disk from those who built the machine.
https://www.belarc.com/products_belarc_advisorIf you don't have the install disk and are unable to obtain one from those people, I can burn you a couple (one spare) of Win 7 SP1 x64 Pro install disks for you to try.
Just PM me your address if you want to try this.
After the repair install, you would need to install all of Windows Updates again, but WSUS Offline Updater can help with this
It's possible that an upgrade to Win 10 could resolve this as those manifest files will just apply to Win 7.
I think this method to free upgrade is still available without any checks being made to see if you apply.
https://www.microsoft.com/en-us/accessibility/windows10upgrade?tduid=(14c348e893a91089cb2980533c6ee123)(256380)(2459594)(TnL5HPStwNw-0FBZfNm6YPFXNhiu3o52rA)()
Probably best to create a system image onto external media first but you get 30 days in which to roll back should it not work out as there can be problems with graphic drivers, but if your machine wasn't compatible then it wouldn't complete and would auto roll back.