how about trying this, i have 98se and this works.
go to Start>Run and type msconfig in the Open box.
On the General Tab, uncheck all items listed under Selective Startup (make sure Selective Startup is selected).
Hit Apply and OK.
This will put windows with only the basics running. the computeer will ask you to restart, say yes. then go to accessories and run your scandisk and defrag. when all done, go back to RUN, msconfig, select Normal Setup and restart windows.
this should work and you do not have to disable anything since this procedure does that for you.
Good luck, snooky