after downloading memtest which is usually in a zip file, unzip (using winzip, winrar, or windows xp). Naa usually file diha nga 'makeboot' ang title. double click. it will prompt you to insert floppy disk. after completion, leave floppy in drive then reboot. It will boot into floppy and run its test (if won't boot to floppy, you will need to go to BIOS and specify floppy as 1st boot device). Good luck!