Anyway ... What did you try. I saw where you mentioned SFC in a post. Was it the Dism command?
If you created install media for 10.0.122 you can try running Dism specifying that as the source
If you downloaded a 10.0.122 ISO - I wouldn't trust it, but if you created an ISO from the ESD update, that should be fine.
Help me out here - where is the install media coming from ... an unknown download or one you created.
The command is:
Dism /Online /Cleanup-Image /RestoreHealth /Source:WIM:D
is the drive letter that has the install media (DVD drive, USB thumb drive, or mounted ISO)
Your drive letter might be different
Glad to hear your laptop can be set to Fast now ... I still don't trust an ISO from sources other than MS