Hi. When you set up Windows 98SE you may not have set ALL the regional preferences to the same non-U.S. English alternative, in which case setup always uses the default U.S. English language. If you did make all the necessary changes during setup, most likely your solution will be found by using the "Regional and Language Options" icon in Control Panel. Set or reset your preferences there, click Apply or Ok as appropriate and then reboot.
When I set up 98SE, I set the regional keyboard settings to my country. Default is US English. I deselected the show icon in taskbar box but it keeps coming back. No matter how many times I do this, it keeps coming back. I even tried restarting the computer right after. It's no big deal but I'd like to figure out how to disable it.