WIN 10 PRO x64 HP E709N INSTALLATION/SCANNER PROBLEM FIXED

After much trial and error and many many installs and uninstalls including one install message that USB 3.0 was not supported (which is incorrect), I decided to try installing the original Win 7 CD which came with the printer using Win 7 compatibility. I uninstalled again including using the HP Scrubber program and tried installing the Win 7 CD but the installation said there was a later version already installed and stopped which caused me to suspect that the registry contained some older HP keys. So I edited the registry using Regedit, using Find and deleted all possible registry KEYS which contain "hewlet" (note that some entries cannot be removed).

The following are 2 examples of HP registry KEYS and associated data:

{9CB4695F-9DF6-4BB5-8848-EF836F319876} | (Default) | REG_SZ | Hewlett-Packard Cue Tray Application 1.0

    where {9CB4695F-9DF6-4BB5-8848-EF836F319876} is the KEY to be deleted.

and

{00063F10-98C8-4C5A-9E3D-1A1AD2FA076A}
    InprocServer32
        (Default) | REG_SZ | C:\Program Files (x86)\Common Files\Hewlwtt-Packard\Scanjet\hpgscnsv.dll
        InprocServer32 | REG_MULTI_SZ | .................
        ThreadingModel | REG_SZ | .................

  where {00063F10-98C8-4C5A-9E3D-1A1AD2FA076A} is the KEY to be deleted.

I then installed the full Win 10 E709n package with USB connection (I deferred actually connecting the USB connect until after I rebooted...I don't know if this deferral is necessary); NOW EVERYTHING WORKS PROPERLY!

The HP scrubber program does not remove all the old HP printer registry KEYS; HP should fix the SCRUBBER problem and repair the installation program.

NOTE: This kind of "fix" may also apply to similar problems with other HP printers and other printer brands. I suspect that many Win 10 hardware and possibly software problems may be caused by old registry entries especially if Win 10 was not installed as a "clean install".

PLEASE LET ME KNOW VIA THE CONTACT PAGE IF YOU TRY THE ABOVE TECHNIQUE AND IT WORKS FOR YOU!