If your hard drive is clicking, grinding or making unusual sounds, the read/write heads maybe scratching the platters. Allowing your computer to run in this condition is like cleaning your CDs with sandpaper. It will destroy your data.

Restarting your computer, rebooting it over and over hoping it will fix itself, or running utilities in an attempt to recover files can corrupt your data. You must turn off your computer now to avoid making your data unrecoverable.