Hi Hazel Whippler,
Before doing anything else, please check whether the Windows download or installation is still progressing on your PC. If it is, let it complete and keep the computer connected to power. Avoid restarting or shutting it down while an installation appears to be in progress.
If Windows is now back at the desktop and you’re unsure whether the process completed successfully, please let us know what you currently see on the screen and whether Windows starts normally.