The first step is to renew your device, also open the power cord from the router, and turn off the printer and computer. Once you have turned on your computer and printer, install the HP software again. However, the system will be suitable to resolve the issue, 123.hp.com/envy4500 
If the HP Envy 4500 “ Printer Not Plant” is detected.
Still, open it from the printer and computer, If the USB string is present. You can uninstall HP Envy printer entries by going to Control Panel – Programs and features – and opting for them all. Your computer should now be renewed.