I am more than happy to help but sorry that didn't do the trick. This is my last simple suggestion before it gets technical.
Step 1: Uninstall everything and reboot the PC, once again.
Step 2: Wait for the PC to fully reboot and disable your firewall and antivirus (temporarily).
Step 3: Go into User Accounts from your Control Panel and create a new user with admin rights. I will provide a link that goes into much better detail than I am offering.
Step 4: After you create the new user account, install the printer, try to scan, and when it fails or if it is successful, remember to re-enable your antivirus and/or firewalls and let me know how it goes!
--Printer Installation Error--
I will be referring you back to this for some more elaborate steps if this doesn't work but they will have to be modified since you are on an HP computer. Just follow the instructions on how to create a new user if you need them and try the installation again as well as the scan, and with the anti-virus off I will be able to tell if this is a problem with the computer. Please do take note of the error because it is more important for me to have it now than in any previous steps. I really hope this works!