The two engines not only prevent your files from being encrypted by hackers or illegally accessed by third-party programs but also protect your PC against various viruses and malware in real-time. With the greatly improved IObit Anti-Ransomware Engine and the latest world-leading Bitdefender antivirus engine, Advanced SystemCare Ultimate 15 brings your PC security to a higher level. It provides you with a one-stop solution to protect your system against viruses, ransomware, and other malware as well as clean, optimize, and speed up your PC. Advanced SystemCare Ultimate 15 is a powerful and full-scale PC security and performance utility.