Since you likely can't access your main PC, you’ll need a working computer and a USB drive with at least (be careful—everything on the USB will be erased).
: Go to Microsoft’s software download page and click "Download Tool Now" . windows 10 boot repair disk download
: Open the .exe file and accept the license terms. Since you likely can't access your main PC,
: Select "Create installation media (USB flash drive, DVD, or ISO file) for another PC" . windows 10 boot repair disk download