With each new Centos based Plesk server, one of the first things you might want to do is remove the dr-web services. This is easily achieved.
yum remove drweb-base drweb-bases drweb-common drweb-daemon drweb-updater psa-drweb-configurator
Should you need to reinstall the server, you can do so in the Plesk autoinstaller or update manager in the main panel.