Usually, if some other applications change files, the Win98 defragger restarts to adjust its settings to the new files. If there are really no other applications running that change file content, maybe there is some problem with insufficient free space for defragmenting or some clusters are corrupted. Run ScanDisk to verify that the disk is in good shape. If the problem still occurs, please get back to me, so we can dig deeper into your problem.
This was first published in December 2002