Windows 10 Need to fix boot loader. Can't boot into windows

I installed Ubuntu 18.04 on my HDD and it asked me to format full drive. So, I backed up my data on my friend's drive and formatted mine and installed Ubuntu but then I came up to a point where I couldn't work on Ubuntu any more. So, I decided to reinstall Windows back. So, I booted in using my Bootable Installation USB drive and installed Windows and it worked properly. The windows was installed properly but after shutting down the PC when I turned that on again it didn't load Windows. It loaded Grub Rescue thing. And I don't know how to come out of the problem. I tried reinstalling Windows. Deleting the all partitions and letting the Windows setup make them itself. But it didn't work. I tried these commands in command prompt from installation drive:
X:/sources/bootrec.exe/FixMbr
X:/sources/bootrec.exe/FixBoot

And both commands completed the processes successfully but it also didn't work.

What can be the problem? And please provide the solution please. Need immediate help.

Thanks for reading such a long post.