Restore a copy of the registry and a copy of system.ini will restore also.
Ways of restoring the W98 registry include:

On the Start Menu, select Shut Down and Restart in MSDOS Mode.  At the
Windows prompt, type:  scanreg /restore      and hit enter.

Boot to the boot menu by holding down either the ctrl or F8 key after the
ram count occurs on the boot screen.  Select Command Prompt Only and at the
C: prompt, type:  scanreg /restore and hit enter.

Boot with the W98 start up floppy disk--CDRom support doesn't matter.  At
the A: prompt, type:  C:     and hit enter.  At the C: prompt, type:  CD
Windows\Command       and hit enter.  At the Command prompt, type:  scanreg
/restore      and hit enter.

Once the registry restore screen appears, select the date of the registry
that you wish to restore by highlighting it and then click enter.  If you
see a registry named:  Rbbad.cab, that is a copy of the registry that has
already been replaced.