Just download and run
SpinRite 6, the worlds best HDD Recovery tool.
Note: You'll need to keep a blank floppy OR a blank CD ready for making the spinrite 6 bootable disk. Then after making the disk, boot your computer from it.
When SpinRite 6 starts, in the main menu goto the second option and change the Level to
Level 5. Press Esc, go back to the main menu. Choose the first option, select your drive and let spinrite work its magic