I understand now - you were not really asking for help.
You determined the Sure Click browser protection software was causing issues and removed it.
Comment and solution in one post.
I misconstrued the following:
"I need to be sure that HP do not install anything else on my PC until it has been properly tested. My productivity has been zero for the last day while trying to fix this."
For those reading:
What / Why would HP install or update HP software on your computer?
If you have installed HP Support Assistant,
If HPSA is set to automatically update your HP software and drivers,
HPSA will update existing HP Software and Drivers.
What to do?
Switch off "auto" updates in HPSA > Settings
NOTE
- If you never use HPSA, it can be uninstalled (it is not mandatory software).
- If you do uninstall HPSA, you should update / check / install your HP Software / Drivers manually or using other available options.
Additional / Optional
Business class machines can make use of business class software / driver update software.
For Example: HP Image Assistant
Install HP Image Assistant to use for updating your HP software and drivers
Single System Management Software – HP Image Assistant
Many newer business (commercial) computers are supported in the HPImage Assistant management grade software.
At this writing: If your computer was manufactured before the EOL date for the Software Download Manager, you can choose to use (or continue using) SDM.
HPIA Information and Download
Business Systems - Client Management Solutions (software management)
Scroll to the bottom of the Website for additional information and links.
HP Image Assistant is a free tool that aids IT Administrators improve the quality and security of their PC Windows image by diagnosing the image, identifying problems, recommending solutions, and analyzing their PC’s readiness for migration between Windows 7 and Windows 10.
HP Image Assistant can be downloaded at the HP Manageability website.
From the Image Assistant Web page:
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