You can troubleshoot an old PC at your home. In addition to common issues to look for, there's another task you should take on -- create a bootable USB drive. I know, I know. The first time I heard ...

Just insert it, enter the UEFI (BIOS) to change the boot device to the USB drive, and follow the installer's prompts. Best of all, this solution is permanently yours—it'll keep working so long as ...