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#21
#1. Repair Install allows you to keep your files, settings and apps.
No product key is required.
Activation is automatic.
#2. I do not have answer for that.
If you wish, please wait a bit. Someone might come along with an answer for that.
Side note :
This is just my speculation. I have no proof for that. None whatsoever.
I have the feeling you have done one registry editing too many.
If you ask this question, then my speculation is unfounded and completely wrong.
I apologize. Please disregard.