I tried creating a new administrator account under the name "Webroot Test" but it did not work.
Anyone any idea on how to reinstall Webroot
Best answer by JimM
The support system is the required point of contact for any matters involving infections. This is because when you contact support, they can get log information from your computer, which is incredibly beneficial towards solving any virus-related issues. Community is a bit hampered in that regard since we don't have the logs that support does.
That said, there is at least one useful thing I can mention about your issue. When Webroot is already installed, and you run the installer, the installer will not do anything. So there's a possibility that Webroot is already installed. Since it's clear this is a virus-related issue however, please reach out to support so they can make a more definitive analysis.