How to restore windows 10?

Question

Windows

Greetings. This morning they brought a laptop with a flying OS. YUSB does not read, so I rearranged their hard drive for myself and installed win7 from a flash drive on my laptop. Threw their hard back, everything is ok. And mine with win10 stopped loading. It says OS not found. In uefi mode, GNU GRUB version 2.02 gets out, because. previously put on an additional disk ubuntu. But I removed it. Googled it. There is a lot of information, but zero sense.
PS there is no installation disk (flash drive) win10

Answer 1

PS there is no installation disk (flash drive) win10

and this is a lesson for you ...
- I start doing regular backups one or more times, losing EVERYTHING (or a lot of important things. I started at home from the 3rd time. At work, it doesn’t count))
- stock up on bootable media after everything boom .. but there’s nothing at hand, and there’s no one to run to .. (here one episode was enough for me) you
need to either:
efi / not efi?
- and set the disk exactly
(because if you just carefully installed 7 on another hard, this is not efi mode , and should not have rubbed your mbr )
- if nothing helps, you will have to restore mbr (or efi bootloader). mbr can definitely be restored even from an installation flash drive 7 .. but here Google is already to the rescue. fingers are tired of typing so much text
- if 10 was efi * ... I think you can turn it into mbr (that is, get by with a flash drive 7), but here you need to understand how everything works, and do everything carefully and accurately .. or look for a neighbor / friend, for downloading the necessary images, and writing to a USB flash drive

ps *

что вряд ли. в биосе была бы запись не только юбунты, но и 10ки тоже. так что скорее 10ка стоит в режиме mbr. тогда бутовской флешки 7 (стандартной!) достаточно. что значит стандартной - Sfift-F10 и вы в консоли, и там базовые инструменты восстановления. в тч mbr. а он для винды универсальный. а вот если сборка,с "навороченным" инсталятором... там может быть все что нужно, а может и не быть. но тогда опять - искать друга...

Answer 2

I can only answer about Grub, because there is not enough data for the rest.
The problem is the incorrect removal of the system. You still have an entry in UEFI with Ubuntu booting, but Grub "and most likely is no longer on the disk. Search for "efi manager linux" and follow the instructions for the efibootmgr utility. You can do this from a Live Linux distribution, with the same Gentoo, ArchLinux, Ubuntu and many others. Just be very careful, otherwise you will also have to flash the BIOS (by and large, nothing complicated, but not desirable.)
Then, as a guess, you should restore the Windows 10 bootloader. system of the same name.It
will take about 10-15 minutes.

PS there is no installation disk (flash drive) win10

https://www.microsoft.com/en-us/software-download/...