In the European Union, in the first half of 2018, the General Data Protection Regulation came into force, which established the new rules for processing users’ personal data for IT companies. The operating systems (OS) are the dominant software that is responsible for collecting and processing data in computer systems. The most common OS is the Windows OS family. The authors identified Windows 10 operating systems, that collect and accumulate user's personal data; developed and tested practically an algorithm, the application of which localizes and blocks the transfer of user's personal data to official servers of the Microsoft company.