Your hard disk is failing/failed. You'll probably need to replace it.
There are a couple things you can do to try and recover any personal files and data on the hard disk if it's still working/partially working.
Attach the laptop hard disk to another computer with an external adapter like these
. Make sure you match the type of hard drive correctly. IDE to IDE or SATA to SATA.
You could also make a LiveCD and boot the CD on your laptop. That will allow you to access the hard disk (if it's still working) and save any files that you need.Ubuntu Desktop LiveCD