Download, unzip, and load the ISO in your favorite CD burning app, and burn the image to the CD.
Pop in laptop. Turn on. Run tests for a while. If you see errors, it means your memory is bad. If you have more than one stick installed, you can try swapping them out to find the culprit.
You can also run into DRIVER_IRQL_NOT_LESS_OR_EQUAL bsod if you are overclocking or overheating. I doubt you are overclocking, but overheating due to dust is a common problem with aging laptops. So de-dust your laptop before you run memtest. You can buy a can of compressed air at any office store- or you can do like I do and just use the blower attachment on your air compressor.