Hi there JuliaLarson, I will be your Independent Advisor for today, I hope we can both resolve your problem.
Lets try to enable app permissions for the Camera.
To go there please click on Start and then click on the gear icon to open up the Settings. Under Settings click on Apps then Apps and Features, scroll down to Camera then click it then choose Advance options, the try to toggle all options under App Permissions.
If that didn't work go back to the same Camera Advance settings window, scroll down and click on Reset.
Try to reboot the computer after.
Hope this helps.