It's a program. You can add it to you Lilo conf. or to grub
and then boot with it. You can also boot from you floppy.
http://www.memtest86.com/
See:
apt-cache show memtest86+
Regards.
I've found and successfully run memtest86. There were no errors
found. I think the cause of the problem in the first place may have
been an unclean shutdown. Any more ideas?