Do what I said to do in my first post.Google for memtest86 and download it and install it to either a floppy or a boot disc and let it run on your computer for quite a while...any errors means the memory has to be replaced.
have someone download the program and either install it to a floppy diskette if that is what you have or install it to make a bootable CD if that is what you need. If you have neither then you can try to replace the installed memory with a different module.