After Scandisk the next cab off the fixit rank should be: (for win 98)
<START><RUN><sfc.exe> and run religiously and conscientiously through that process (first run-through is always lengthy). It sorts wrong versions and corrupt system files. It has resolved all my glitches time and again. You need to do a run-through after program installs or Win98 re-installs also.
then<START><RUN><msinfo32.exe> and go into
<TOOLS><Version Conflict Manager> and ensure that current versions are later ones.
Norton Windoctor is also a good idea. (part of Norton System Doctor)
Windows REGCLEAN will always find potential trouble also. Most windows hiccups are caused by Win system file versions being replaced by older ones in poorly constructed shareware and thence getting corrupted and thereafter being unable to cohabit peacefully.
Finally, a lock-up of the scroll-bars normally means that you've run down your system and GDI resources (and maybe have some locked up memory that's not been released) so a pseudo-reboot (which will leave you connected to the NET) may be in order. Open a Notepad Window and look at it's HELP drop-down and note the % resources available (or load resource.lnk into startup as follows):
copy the shortcut
\ WINDOWS \ Start Menu \ Programs \ Accessories \ _System Tools \ Resource Meter.lnk
over to
\ WINDOWS \ Start Menu \ Programs \ StartUp
and keep the free Windows Resource Meter running in your system tray. This is an easy way to watch those system resources when they start running low.
For the pseudo-reboot simply go CTRL-ALT-DEL and highlight the main WIN EXPLORER line and hit <END TASK>. The shut-down screen will come up. Hit CANCEL and wait 7 seconds (the "close explorer" panel will open). Hit <END TASK> and a new copy of Explorer will load. Now re-check your resources and they should be back up in the late 80's or early 90's. Locked up memory and resources are released and refreshed.