Knowledgeable computer users will tell you it's not the best idea to have more than one Antivirus or Internet security package running at the same time on your PC. They usually don't like each other and can cause system instability, degrade performance and maybe even cause viruses not to be identified correctly. Or, buy a Mac or a Chromebook and avoid Windows altogether. To make entering numbers easier, you can copy phone numbers from the Recent calls list in the Phone app and paste them into the Block numbers list.