Windows comes with its own memory diagnostic tool. Use the Search tool that came with your version of Windows (for instance, Start > Search in Windows 7, or the Cortana field next to the Start button in Windows 10). Search for memory and select Windows Memory Diagnostic.
Windows will shut down, and your computer will reboot into the memory diagnostic program. You don’t have to do anything but wait. When it’s done (just a few minutes), it will boot back into Windows.
