Run hard drive diagnostics: http://www.tacktech....ay.cfm?ttid=287
Make sure, you select tool, which is appropriate for the brand of your hard drive.
Depending on the program, it'll create bootable floppy, or bootable CD.
If downloaded file is of .iso type, use ImgBurn: http://www.imgburn.com/ to burn .iso file to a CD (chose "Write image file to disc" option), and make the CD bootable.
NOTE. If your hard drive is made by Toshiba, try the Hitachi DFT CD Image version of the software
Thanks to Broni for the instructions