Hello TamyJW,
I understand when you are trying to send a fax you are getting an error 'This message could not be sent. Media write protected'. Can you please let me know the Exact model of HP Printer you are using?
After some research on the Microsoft Support Pages, I was able to find a possible solution, take a look below:
1. Open Control Panel
2. Select Programs and Features
3. On the Left select Turn Windows features on or off
4. Uncheck Print and Document Services
5. Click OK
6. Restart the computer
7. Now go ahead and repeat Steps 1-4, but re add the check mark in the Print and Document Services
8. Click OK
9. Restart the computer
10. Try the fax again
Please let me know if this was successful, I will watch for your reply.
Thank you,