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I'm trying to help a friend but I'm not very good with computers
There's crucial files missing so the computer doesn't boot by itself but hitting esc key makes it boot somehow
System restoring didn't work, it just wiped all the drives, videocard drivers can't update
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Try this tutorial : http://wind8apps.com/fix-windows-10-windows-8-will-launch-recovery-boot-configuration-data-file-missing/

It is the same for Win10, you need to first solve the Bootrec then everything should work.
Post edited October 08, 2015 by user_7643
You can try with sfc /scannow from an administrator prompt.
Trust me, here is the Swiss knife for windows.
http://www.tweaking.com/content/page/windows_repair_all_in_one.html