|If it already has 98 on it, why do are you asking about installing it? Is it corrupted and not running right? If so, you should be able to use the upgrade disk and 'upgrade' from 98 SE to 98 SE. I'm pretty sure that works but don't recall if I've tried it.|
But to your question:
You can use an upgrade disk for a fresh install but you have to go about it differently. Upgrade and full version disks are the same except for the precopy2.cab file. So you copy the the contents of the WIN98 folder from the upgrade disk to a similarly named folder on the hard drive. Then you acquire the precopy2.cab file from a full version disk and copy it over the one from the upgrade disk. Then you run the 98 setup from the hard drive.
That's discussed here:
I'm not sure the links in the posts there are still good.
You also need a valid 98 product key and I'm not sure the one from the upgrade disk will work as I think the product key verification formula is also in the precopy2.cab file.
Oh, before doing the above, check first to see if you already have the 98 installation files on your hard drive. Often if it came preinstalled there will be a WIN98 folder on the hard drive already with all the files you need. Then to do a fresh install you'd boot to dos with a bootdisk and delete everything except the WIN98 folder.
But the easiest way may be to check and see if you can find a full version 98 cd on ebay instead of going through the hassle above. Or just borrow a disk from someone.
Real men don't use AntiVirus; they just reformat