System extension hpPlugInInit.kext was installed improperly and printing won't work

Installing the software results in non funclltioning or poorly function printer on both of our macs. Each computer has a printer. I get a message that "System Extension cannot be used. "/System/Library/Extensions/hpPlugininit.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the products vender for an update.
An Apple repair shop 60 mi. away didn't seem to have much problem getting one computer fixed today. I reinstalled the software and the printer printed today. I started the set up with a cable connection and then the printer wanted to go wireless. It printed but only did one side of a page. I haven't had the printer for very many months and it did do two sided printing and everything else. I think the problem may have started after an Apple software update. I cannot delete the damaged software. It is protected from my messing up the software.
This computer will go to the shop Thursday morning if I can't fix it before that.

Hi,
click the Finder icon, then click the Go menu and select Computer.
Select your active boot volume, will usually appear as Macintosh-HD.
Browse to System > Library/Extensions and type hpPlugininit into the search bar, select to search in the Exxtensions folder and move the hpPlugininit.kext file to the trash.
Empty the trash, then reinstall the latest driver below:
http://support.hp.com/us-en/drivers/selfservice/HP-ENVY-5660-e-All-in-One-Printer-series/6809225/mod...
Note: Be sure to check the HP Scan option to get full functionality.
Please let me know if that helps,
Shlomi
Say thanks by clicking the Kudos thumb up in the post.
If my post resolve your problem please mark it as an Accepted Solution

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System extension hpPlugInInit.kext was installed improperly and printing won't work

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