Malware Bytes is a perfect extension to your antivirus. While most antiviruses focus on actual viruses, this program comes to complete user protection by tackling online threats that a regular antivirus cannot identify. The best part about this software is that it is actually compatible with most antiviruses, so they will not interfere and affect each other. It goes deep into registries and files, so it can remove even the deeply embedded scripts. Aside from the free version, a premium one is also available.