82.SOLUTION : This error occurs when Disk Defragmenter is unable to read from or write to one or more bad sectors on the hard disk. The error ID is DEFRAG005 when Disk Defragmenter is unable to write to a sector and when it is unable to read from a sector, the error ID is DEFRAG006. To fix the problem, you need to run Scandisk with the Through opton enabled, as you have already done. Since you have not found any bad sectors and the problme is not yet fixed, you need to configure Scandisk to detect disk timeouts and check each cluster five times while performing a surface scan. To do so, you need to do following things.

1. Use notepad to open the Scandisk.ini file, present in the Windows\Command folder.
2. Create an [Environment] section in the file, if the section does not already exist, and then add the following lines to the section, if they don't already exist:
   Scan TimeOut=On
   Num passes=5
   
3. Save and then close the Scandisk.ini file
4. Restart the Computer in MS-DOS Mode and then click Yes. Type the following line:
   Scandisk c:
5. Then press [Enter] key to run the Scandisk

You should run the surface scan when Scandisk prompts you to do so, and repair any errors that it find. You can then restart your PC normally and run Disk Defragmenter.