System files outdated – Windows 98

I have downloaded a free Chinese dictionary,when I unzipped the file and to begin the Setup,it runs the installation up to a certain file and stop.A message said that the system files are outdated and needs to update,press OK. to update.When I updated the file(Windows update automatically after you reboot the computer),and start the Setup again the same message appears again. What and where have I gone wrong? Help needed.