Unable to install HP Envy 4500 Software - Error 126 Dec 1, 2017 5:01:04 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by account_disabled on Dec 1, 2017 5:01:04 GMT -5 I am having trouble installing the required software for my HP Envy 4500 printer. I keep getting the error:Error 126: Failed to add port monitor HP Discovery Port Monitor (HP Envy 4500 series).I have the printer set up fine on another computer and I can use all functions from it with no issue.I have tried disabling firewalls/antivirus on my system (Windows, Avira, Malwarebytes) and still get the same error.I am running Windows 7, 64 bit on a Lenovo W520.Any tips?Please help.Thanks!I didn't find the right solution from the Internet.References h30434.www3.hp.com/t5/Printer-Software-and-Drivers/Unable-to-install-HP-Envy-4500-Software-Error-126/td-p/5992925animated Corporate Explainer video