Have you ever booted another operating system alongside Windows? Dual booting is a great way to try out new operating systems ...
Booting from a USB stick is very helpful for many purposes. However, many factors have to be right for the boot to work ...
If you can't boot into Windows after deleting the Linux partition, and see errors like "GRUB rescue>" or "no boot device ...
If you cannot boot into Windows after installing Fedora, identify the BOOT mode, update GRUB configuration and enable OS detection to begin with.