The install file should prompt you, or you should have a Floppy in your floppy drive, once you have a floppy in your drive, click the install, and it should make the floppy into a boot disk for memtest86. After it is finished with the disk, restart and make sure your bios setting is set so the floppy will boot first. Have the floppy in when you exit the bios and restart the computer. It should then take you into memtest86 right after the POST of the bios