Your message should go under the Express discussion group. However, if you go into that group you will find (I think) references that say R2004 is NOT fully compatible with Win98.
who say! i'm try not running with express instaler but
extract the zip file to express folder after that fire the autocad2004 and it's auto load menu for express it's work well
Dean Saadallah said:
Read your product box, notice Win98 is not in the OS requirement. UPGRADE.