I installed Elementary OS on a laptop, there was windows 7 on the disk, Windows does not start, what should I do?

Question

Windows

ASUS K55VD laptop, on a half-terabyte disk divided into two parts (that is, the Windows 7 folder and the data folder in which I store all the files), loaded elementary OS from a USB flash drive, after a successful launch, I turned off the laptop (I didn’t load the OS itself on the disk, it worked from a flash drive) and when I decided to turn it on again, a black screen appeared with errors, it was not possible to form the operating system, okay, I turn it off, turn on the BIOS, try to start Windows - hell there. I got a 350 MB Linux GUI interface, I don’t understand anything and it doesn’t see any disks, only a small piece of a screw on which this interface was installed, a screw in the trash?

Answer 1

If everything is as you wrote, then Elementary OS has nothing to do with it. It booted from a USB flash drive into RAM, as described above.
Boot from a Live cd with Hard Disk Tools and GRUB.

Answer 2

try EasyBCD, and if it doesn't work out, take it to the master (or call).