Hi Dan, my name is ***** ***** I'm here to answer your question today.
How did you go about removing Windows 10? Did you use the rollback function in Windows 10 or use another method to delete it?
From what you describe, I suspect you completely erased your drive and you will need to reinstall Windows 7 from scratch. Do you have Windows 7 Installation media, such as a DVD?
Please respond back so I can help you with the best options for repairing your laptop. It would also help if you can provide me the model of your laptop
Based on what you provided, can you verify this is the exact model of your laptop. The specific model number that HP uses may be a variation of what you gave me.
If this is accurate, I can provide you an avenue for obtaining installation media.
If that is the correct model of your laptop, you can obtain replacement media here:
Also provided at that location is instruction on how to create a bootable disk to perform a re-installation.
Optionally, you can obtain the original installation media from HP. they do however charge a fee for the media:
With one of these options, you should be able to restore your laptop as it came new. You will of course need to reinstall all of your applications and updates.
Please be sure to rate my assistance. If you have additional questions on this subject, please reply back. If not, accepting my answer and rating my service will close this request.