Go to:
http://msdn.microsoft.com/library/tools/htmlhelp/wkshp/download.htm
and download and install Hhupd.exe 1.32 (716 KB)
(http://msdn.microsoft.com/library/tools/htmlhelp/wkshp/hhupd.exe)
Another variant is, if possible (and you find yourself experienced enough) to try to make "clean" instalation of Win98:
First make emergency boot disk <>
(it will be with CD-Rom drivers) (make it from Control Panel/Add-remove programs/Startup Disk/Create Disk)
Then boot to ms-dos prompt (by pressing F8) before windows has started to load and selecting "Command prompt" from the menu.
Delete the whole windows directory with the following commands:
attrib -r -h -s \windows\*.* /s
deltree \windows
Then Reinstall Windows from your setup disk (you may need to boot from the <> if you do not have the original Setup diskette of Windows 98)
Hope this helps,
Zlatin Zlatev