getting the following screen at shut down

Without know if that screen stays al the time or just quickly shows and disappears, and not knowing yur model and year Mac:

Reset SMC and NVRAM (if applicable).

How to reset the SMC of your Mac - Apple Support

Reset NVRAM or PRAM on your Mac - Apple Support

Try booting to Safe Mode. That boot up takes minutes and clears caches and other things that may resolve your problem.

How to use safe mode on your Mac - Apple Support

A lot of times just boot to Safe Mode followed by normal boot resolves problems.

Does one mean this one? This solution addresses Webroot SecureAnywhere for macOS 10.10 and higher ?

The only protection this software is doing - IMHO - is protection the Developers Bank Account and providing zero return to the user ( you ) except the trouble it is creating on this computer

Suggest contacting the Developer for Instructions t remove their software.

Regardless -

There are no known Windows-like Viruses in the wild that self replicate and affect macOS, because of the underling UNIX  Foundation and Permission Limitation. 

The The Built in Security  is all that is required to protect the computer.

Should “ Certain & Specific Software “ referenced from above be installed - it will negatively impact macOS. It is suggested, to download directly from a respected ASC Contributor, the application Malwarebytes for Mac. 

It is free or paid for added features. 

Run the Application and it should remove the malware / adware. Once done, restart computer and test.

Very quickly - is Intego AntiVirus or any other AntiVirus Software installed and running ?

If you do not want it I would try uninstalling Webroot antivirus using the developer's instructions.