Give it a try using the instructions in the link below. Make sure to temporarily disable all the Norton programs and antivirus first.:
What Do I Do When Scandisk and Defrag Won't Run In Win9.x/ME /b]
Hope this helps.
using NSW 2005 with win98.
I tried to run Speed Disk to see if drive C was too fragmented. Speed Disk doesn't complete the analyse/scan of drive C. It just reaches 35% or 40%, and then repeats it again. I clicked "close".
Hope that made sense.