Try this:
CLEAN DEFRAG:
To defragment all your hard drives/partitions with no overhead (background programs running or TSRs/VXDs loaded), change to the \Tools\Mtsutil folder on your Win98 Setup cd-rom, and right-click on Defrag.inf. Select Install.
This will create a one-time entry (DEFRAG.EXE /ALL) under this Registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServicesOnce
Defrag will start automatically next time you boot, before the login prompt, therefore before any other program loads.
reghakr