temporarily install your harddisk to another system which has a cdrom, copy win98 installation files to your harddisk, mount back the HD to your own system, launch "setup.exe"
A stupid question: I have a third hand IBM 486, enough RAM, Modem, with WINDOws 3.1. If it is possible to install WIN98 on it, I want to use it to go to Rolia. How to do it, who can help. (No CDROM).