Ransomware Protection is not available for Windows XP and Vista. These older Windows Operating Systems do not have the technology necessary to run Ransomware Protection. For more information, refer to Malwarebytes 3 - Frequently Asked Questions on the Malwarebytes forums.
If Malwarebytes for Windows is installed on a computer with a Windows XP or Vista operating system, Malwarebytes for Windows reports Ransomware Protection is unavailable.
To protect your computer from ransomware, we recommend you upgrade your computer's operating system and enable Ransomware Protection. Refer to Malwarebytes for Windows, Tech Specs for supported operating systems.