Error installing Driver on Windows 10 for HP Envy Pro 6455 (6400 series)

[Shibu4747]

Even after installing the suggested drivers/apps, I am not able to print from my laptop.

Both my laptop & printer have wireless connection over the our Home WIFI.

When I checked the Device driver information, seems like my printer is listed as "Unknown Device".

& trying to update the driver gives me the below error message.

The driver cannot be installed because it is either not digitally signed or not signed in the appropriate manner.

Below is the screenshot of the complete error message.

Thanks,

Chandan

[sandytechy20]

@Shibu4747

Welcome to the HP support community.

I understand that you are getting driver issues while printing, I am glad to assist you.

Uninstall the printer driver from the root level and reinstall it to fix the issue.

Perform root level uninstallation to remove all the printer related software's.

• In Windows, search for and open Programs and Features.
• Select your HP printer.
• Select Uninstall.
• In Windows, search for and open Devices and Printers.
• In the Devices and Printers window look for your HP Printer. If you see it listed, right-click on it and choose "Delete" or "Remove Device.”
• Open up the run command with the "Windows Key + R" key combo.
• Type printui.exe /s and click OK.
• Click on Drivers tab.
• Look for HP Printer driver. If you see it click on it and click Remove at the bottom.
• Select OK.
• Remove all instances of the same.
• Select Apply and OK on the Print Server Properties windows.
• Close Devices and Printers. 
• Restart the PC again.

Download and install the printer using the HP Smart app

Click here to download.

Keep me posted.

If this helps, please mark the public post as an accepted solution so that it benefits several others. 

Cheers.