Windows 10 reboot after upgrading from windows 7

I have strange issue only with 1 laptop, upgraded the windows from 7 to 10 pro, when it boot after few min it restarts ,
If I turn the network connection, reboot system before it restart itself, after next reboot after login turn the network enable . system work fine as long it is not restarted .

1) virus scanned
2) Sfc /scannow " find corrupt file cannot repair "
3) run the online repair - re image " cannot download required file "

tried to go back to windows 7 . error again delete the newly created account which is Administrator and cannot remove administrator.

need a help please ......... please

I would suggest a clean install of W10 will be a good way to sort this out. Of course that will mean you need to create backups of all your files. favourites, etc. first and have a list of all programs that you need to reinstall. It may seem like a lot of work but it will be a much better system in the long run.