HP printer malware

Delete you current HP print queues, and use this HP article to remove the old Drivers.

then add-A-printer and MacOS should fetch new Drivers for you and install them.

HP Printers - A [software component] will damage your computer message displays when printing or while installing (macOS)

https://support.hp.com/us-en/document/c06960563

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system Preferences > Security & privacy ...

Click the padlock in the lower left corner to make changes.

Then without closing that window, double-click on the Un-Installer again. You should get a new button in security & privacy that says (open anyway) or similar. click it to proceed.

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This occurs because the Un-Installer is so old, it does not have a Registered Developer Certificate, and must be opened as an exception item. [sloppy.]

Tried this. My iMac will not open the HP uninstaller. What now ?