Posted 02 July 2006 - 10:37 PM
I don't think it's possible. You need the upgrade version. And you need a license key that matches the upgrade version. The best you can do is save your files (somehow . . .) and install Win 98 SE from a cleanly-formatted drive.
FWIW . . . it's been my experience that an upgrade is junk anyway. My first Windows system came with 95 and a free upgrade. I got the upgrade a couple of weeks later and installed it and it was full of bugs. Things like Windows 95 menus popping up on the screen when you moved the mouse. I bought a 98 full edition and did it from scratch and it all worked fine - until I was able to get a copy of SE, which I immediately installed. (Not an upgrade!) I used to do a lot of gaming and re-installed from scratch about every three months to keep it cleaned up.
These days, I don't upgrade so often. Win XP has been running pretty smoothly for about a year.