Installed two operating systems on the hard drive. I want to load windows back, but it doesn't work. What to do?

Question

Windows

Judging by the data, all windows files are saved on the hard drive, but instead of it, the new OS that you installed starts when you boot. Help programmers!

Answer 1

In a separate partition on the hdd that I created

Use a separate disk for experiments or a virtual machine.

Answer 2

What, how, why, where... What for to tell - let the people who want to help - suffer!
Recreate the boot menu. Manually, on the command line, or use software like EasyBCD

Answer 3

You need to change the startup order in the bios.

Answer 4

Run the BIOS and try to select the first CD-DVD drive, then restart.
If it doesn’t help, try to poke the F8 or F4 buttons at startup (the display will say which button will start Recovery) should get to the unsuccessful boot section WIndows, and from there select the item CONTINUE NORMAL WINDOWS START