How old is the drive? What's the level of fragmentation like? And have you run chkdsk at all? If check disk doesn't report any problems with the disk it shouldn't be that serious of a problem - yet. Specially if it turns out you've been lax with defragging.
Though, if you still want more reassurance you should download and run
HDD Regenerator. This program will help you to repair any bad sectors on your drive. I've used the program many times in the past and I can attest to its effectiveness. If you download and run the free trial version it'll attempt to fix the first bad sector. It it was successful, hit up torrentspy for a cracked version and have it fix the rest of the drive.
However, in the event that it shouldn't be able to fix the first bad sector, as far as I know there's nothing you can really do. There must be something seriously wrong with the drive.
How ya doing, buddy?