I get "Access Denied" everywhere after upgrade from Windows 7 to Windows 10

[quercus.dk]

Hi

My Windows 7 was working perfect and has been for years and I was really not in the mood for upgrading to Windows 10. What if something goes wrong? Can I be sure that all my programs and all the personal settings that I have made to those will work? I could not handle to spend weeks setting all this up again to fit my personal settings and daily work.
Then 2 weeks ago my computer started telling me that I had 15 minutes, before it would upgrade to Windows 10. I postponed that for 8 hours and letting the auto-upgrade know that I needed more time. I did that many times for weeks. Then the other day I totally forgot about it when I was sitting in the garden and enjoying the sun. When I came back in my computer was in the middle of an upgrade! Oh, no!!!
And my worst fears came true! My Windows profile is a total mess! I get “Access Denied” everywhere. My Skype won’t logon, I can’t open Word and write a document, my Outlook .ost file is not readable, my Internet Explorer is not working perfect.

I found out that it’s my Windows Profile and lost ownership of folders and wrong access rights, especially on \users\myuser\AppData\ folder. I have searched the Internet for all kind of solutions, nothing works. I found this and tried all the solutions:
https://www.reddit.com/r/Windows10/comments/3g42rn/updated_to_windows_10_now_im_getting_access/

Then I remember! Some 4 years ago you saved my day. Your repair tool fixed my computer in 5 minutes after spending hours with other solutions.
So, I have tried to run the Repair Tool and tried fixing the ownership and access rights on my folders. But it does not work – I’m sorry.
From the Internet I can see, that some people think it’s OneDrive that has messed up the rights. I was getting a lot of “OneDrive could not start, due to an other process is already running”. And it’s really hard to get rid of OneDrive in Windows 10 and when coming from Windows 7 with original Groove.exe and later OneDrive for Business, it could be that this totally messed it up.

Bottom line:
I lost ownership and full access to folders inside \users\myuser\ including AppData
It shows an unknown user: ? S-1-5-21-6464646….

I had hoped that the Repair Tool could fix it, but I had no luck.
Any suggestions, other than making a new profile and start all over.

Best regards,
Henrik

[Boggin]

I think it would probably best to revert to Win 7 and then download the GWX Control Panel until you decide you want to upgrade, but time is marching on for the cut off date.

http://www.howtogeek.com/220723/how-to-uninstall-windows-10-and-downgrade-to-windows-7-or-8.1/

http://ultimateoutsider.com/downloads/

If your current profile does not allow you to execute either of these as you need to be logged in as an admin, then see if you can create another admin account or boot up into Safe Mode to use the Command Prompt and activate the hidden admin account with this cmd -

net user administrator /active:yes

Reboot then log in using the Admin icon.

You should then be able to create a new user admin account.

To deactivate the hidden admin account, change :yes to :no and reboot.

[Julian]

You are getting unknown sids?

[Julian]

Well in windows 8 and 10 the app store creates unknown sids I would say leave those sids alone because removing them may cause further headaches. Hmmm let me think for a moment... Have you tried to run the registry and file permission repair already.

[makinero]

I have a similar problem but the problem is that when I try to "Repair Windows 7" (I select "Update" - save all data)
After installation:
Security options are broken. Always show "Unknown Account"
Since the system deletes the old account to a new one is different.
How to perform a proper repair of the system? After installation, do not change the original previous account.