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#11
The application Dell Backup & Recovery Manager creates WIM files to restore the system to a previous state. This was working properly until this Windows 10 upgrade installation.
I upgraded to Windows 10 using an DVD that had the Windows 10 ISO mounted, then reverted back using the 'Settings > Update & security > Recovery > Go back to Windows 7' option the same day itself. When it removed Windows 10 then everything including the Windows activation returned to the earlier state.
Thanks.