Acronis True Image: computer unexpectedly boots into Acronis rescue environment

Symptoms

When you turn on the computer, Acronis bootable environment starts up unexpectedly instead of Windows.

Acronis Startup Recovery Manager was not activated or used.

Cause

Windows boot manager is not first in the BIOS/UEFI boot order list. External disk, CD/DVD or USB thumb drive with Acronis Bootable Media/Acronis Rescue Kit is higher in that list.