It means your hdd isn't being recognised, this shouldn't stop you getting to the bios though so go into the bios and see if the drive is recognised and is set to first boot device.
Other than that I'd check all the cables are plugged in properly, try a different cable if necessary.Worst case scenario is a dying hdd.
I did a quick search and came up with this:
Start the recovery console, boot from an installation CD and select R for repair.
Run these commands -
chkdsk c: /r /p
exit (to reboot)
That is it.
and also some saying a corrupt windows file system and advice to do a repair install of Windows if you encounter this error when upgrading to XP (go figure) so I guess that is also something to try if all else fails.