There are times when Win98 just needs a
refresh to get it back up and running.
Prcedure is
Boot to DOS mode ...Press F8 after system boots and BEFORE "Starting Windows98" comes up ..You need to get your timing right
Type CD WINDOWS "Enter"(changes directory to the Windows)
Type REN WIN.COM WIN.OLD (renames the win.com file to win.old)
Either reboot with your win98 floppy in A and the win98 CD in CD drive and select "run Windows setup from CD"
OR if your system is set to boot from CD just reboot with the windows98 cd in the drive and select "start computer from CD "
You can change the BIOS system boot sequence to A,CD,HD on most systems but each bios is different so I won't even attempt to describe how
When Windows setup asks for the directory to install windows it MAY default to C

Windows.001 Make sure you change it to C

Windows (assuming that is where your original windows was...Otherwise step one wouldn't have worked)
After the appropriate wait (and numerous coffee/red wine/coke depending on your age

) your system will have retained all your drivers, installed programs, email settings, and sadly ALL the virii and spyware
Hope this helps
MAx