McAfee Security Scan Plus is free diagnostic software suite developed by McAfee Inc. It actively checks your computer to ensure that system is protected from threats. The software is designed to support Windows XP, Vista, 7, 8 and 10 editions. The system requires at least 256 MB of RAM to run and operate the software for scanning and detection of viruses, along with their protection. Its flexibility and simplicity make it a recommended choice for beginners.