Okay; at this stage you are definitely going to have to reinstall Windows. You have wiped your hard drive.
Lets first of all find out if your PC can boot from the CDROM; that makes the installation of Windows more straightforward. Do you know how to enter the BIOS and check/set to boot from CDROM? If so, set this up, put the Win98 CDROM in the drive, remove anythg from the floppy dirve, reboot and reinstall Windows. Don't use any of the other disks until you have sorted that bit out first.
Do not connect that PC to the internet until you are ready to install antivirus software, etc.