Win 7 to Win 10 upgrade, all files Unknown+User and Unknown+Group

[mn]

I upgraded from Win 7 to Win 10 and I am not able to run a tar command
on my files. Everything was working as it should before that. I will
add that I am working on backup files and if something goes wrong I
can lose like a year and a half of full day / week work. The name of
my user is 01 and all files and folders are now showing as
Unknown+User and Unknown+Group. Please let me know how to make it
work.

Thanks.

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