How to remove Trovi - Chrome etc. Security software needed?

Non-Apple "security software" won't help and is likely to cause other, unrelated problems.

To learn how to avoid infesting your Mac with adware in the future, read How to install adware. Apple's instructions are linked in the Recovery Procedure near the end of that document. Read and follow them carefully.

You probably need to remove a Chrome extension. Refer to the built-in help for instructions.