I'm new here and would very much appreciate your help

I was making a bootable USB to rescue a crashed Ubuntu notebook.

I was doing this on my Sony VIo laptop, now I can't access my Sony files, when I boot the Sony up it boots in Ubuntu

I think I have overwritten the windows boot sector with Ubuntu

I need to either undo the process or if this is not possible then at least recover my kids childhood memory photos

Any help to resolve this issue would be very much appreciated

P.s I have since removed the hardrive from the Sony and tried to read it on a windows machine as an external drive, windows can see the drive but with no data!