You could put in the floppy drive and install DOS 6.22 onto the hard drive then boot up from the hard drive and install Win98 off of the CD that way.
You can get DOS 6.22 from a couple different websites.
I'm not sure if it's against forum rules to post them since I think DOS 6 is classed as abandoned but just to be safe I won't post them here.
PM me and I'll look up the link.
Sean