The short answer is NO! Any communication with these evil people will only increase your potential risk. Even if you just ask them to go away this will motivate them to attack you more. Get the book "Your Personal Information is at Risk" and learn how to recognize this risk and what to do about each type.
Yes, although only effective against certain threats, it is a must have first layer of defense. You should also make sure that your operating system or end point protection have a software firewall as well.
Typically any end point protection software that you buy is better than the free because of the support and automation that comes with it. Any is better than none. I would rather drive a Ford or a Chevy than walk.
Frist think of all, pictures, etc., that you have stored on your home computer. Would you want it to be all destroyed. If a bad guy gets into your computer he can make your data unavailable to you.
Next, think about what personal data is on your computer. What could a bad person do with that data? Finally if a bad guy gets into your computer he can see all that you do, to include your ID's and passwords to you health info or bank accounts and then take actions on your behalf.
For more information on how to protect yourself check out the book "Your Personal Information is at Risk: A Guide to Protecting Yourself" by Rich Owen.
It was created by the founder of this site, the then owner of Optimal Information Security Services, in 2003. Whereas Johnny Appleseed planted trees, Johnny Security Seed provides guidance of how to protect ones' personal and business information. The purpose of Johnny Security Seed is to spread enlightenment in how we can protect ourselves.
The importance is not the size of the business, but the value of the information and the impact if it was not adequately protected. Our books cover the world of information protection from the individual to the multi-national corporation. The same applies to our services.
It is important to establish good cyber hygiene when one starts to create and access their information. Good security starts at home. These lessons are the fundamental building blocks of our present and future.
"The Alchemy of Information Protection: A Cybersecurity Druid's Spell Book" has been released. Although it will be enjoyed by CISOs, it was written for the Non-Cybersecurity Executive and the person who is tasked with creating a security program.