Feline, have you read this
http://support.microsoft.com/default...54&Product=w98
and this
http://support.microsoft.com/default...63&Product=w98
for some good info?
There is also this from Msoft
The Disk Defragmenter for Windows 98 (DEFRAG.EXE) may start and
not complete its task. If repeated attempts to defragment the drive
are unsuccessful, it may be because an application is writing to the
disk. The Disk Defragmenter cannot share access to a drive with
other tasks.
An application loading automatically at startup may interfere with
DEFRAG. Run DEFRAG before applications load at startup by adding
a value for DEFRAG.EXE /ALL to the RunServicesOnce key in the
registry.
To add a value for DEFRAG.EXE /ALL to the RunServicesOnce key:
1. Select DEFRAG.INF in the \Tools\MTSutil folder
on the Windows 98 Second Edition CD.
2. Right-click DEFRAG.INF
-or-
Hold down the SHIFT key and press F10.
3. Choose INSTALL to add the value for DEFRAG.EXE /ALL.