Hello Michelle Dillard, welcome to Microsoft Q&A forum.
This appears to be related to Google reCAPTCHA configuration rather than Windows/Microsoft. The "invalid site key" error typically involves site key/domain settings in Google's reCAPTCHA system.
If you're a visitor, contact the website owner. If you're the website owner/developer, you should reach out to Google reCAPTCHA support or web development communities.
I hope this helps point you in the right direction.