Hello-
You can try to do a complete L3 uninstall :
If you downloaded the drivers (Full Feature) , then go to your temp folder (start button/search/ type" %temp% "/7z***** folder) . When you find the 7z folder with the install software in it, go to the "util" folder, then the "ccc" folder. At the bottom of the "ccc" folder you should find a "Uninstall_L3.bat" file. Disconnect all cables (if USB) and run the L3 by double clicking it. After the L3 completes, you will have to re-boot PC.
Once the PC is back up and running, go to your "Computer", then to your "C:" drive, then "Programs Files (x86 if 64 bit OS) ", then HP and look for a file with the name of your printer. Delete the entire file.
After that , Go back to the temp folder (%temp%) and open the 7z folder again. scroll down to the bottom and run the setup.
Let me know what happens.
Also, if you used the disk to install, you can explore it and find the util and ccc folders on it.