OK... I would have offered to do so before, but I thought you said you had done so already.
Try the procedure again, this way, leaving out no step, however unimportant-sounding:
First, disconnect the printer, turn it off and unplug it from the power. Leave it that way throughout the following, until you are instructed to connect it up again by the installation software routine (or, at least, by that routine having completely ended and finished and exited etc.)
So: turn off, unplug, unplug your printer.
Go to your computer, to the Start button, then to Control Panel - Devices and Printers, and remove all entries for your HP printer and its series, by clicking on each of its icons (or entries) and deleting.
Then go to Control Panel, Programs and Features, and use Uninstall (or Remove or Change/Remove) to get rid of all programs specific to your HP printer.
Then, reboot your computer: shut it down and start it up again.
Then, go tohttp://support.hp.com/us-en/product/HP-Officejet-6700-e-All-in-One-Printer-series---H7/4322971/model/4323605/drivers/
and click on the blue Go button, and then download the HP Full Feature Software and Drivers, wait for the download to complete and Save To file on your hard disk. Then locate the downloaded installer file, double-click on it to start the install routine, and install the drivers etc.
Then you might go to that page, to the Utility-Diagnostic Tools section, and download the Print & Scan Doctor program, and run it - then see what it indicates.