To test the memory of your computer you need to use Memtest86+. Please go to the official website and download a version suited for you and download, then download it on a USB drive. You can use RUFUS to make your USB bootable. Once you've launched the application, perform a test of the RAM using 1 PASS. If there are no errors you will see OK in the results. If there are any red messages then the RAM needs to be replaced.