I used to only own 'upgrade' versions of Windows (cheaper).<p>Whenever I had to reinstall Windows (which was frequent back in Win98 days), I had to first install DOS from floppy, then Win 3.11 from floppy, then a CD-ROM driver, then Win95 from CD until I could finally install Win98. (at one point I acquired a non-upgrade version of Win95 but it came on 20+ floppies, so the installation was not really much faster).<p>The end-result was a Win98 installation with a lot of old software lying around as the 'upgrade' installers did not always remove all of the existing items.