Aahhhhhhhhhh Win 98 those were the days..
Anyway from what I remember this is for
Keyboard go to
Settings >Control Panel>Keyboard Once you selected Keyboard Use
Add this will or should allow you to add your language you need select language and press
save or
ok or both.
Also you may want to change you Regional settings for what ever reason.. Go to
Settings >Control Panel>Regional settings Once you selected Reginonal settings Use tab down button I think or a scroll key...set....then save.
ps Sorry If your going to do a new install it also has the option to change Language when installing...