Russ: are you kidding us?
SE stands for "second addition".
Really?
Did you not mean "second EDITION"? Or were the letters S and E not large enough clues for you?
You must have 98 loaded before you can load 98SE.
No, not true! If I remember correctly, Win 98 SE was indeed a second edition, or issue, of Win98, and became the preferred of the two versions due to many corrections and improvements. (It was sort of like a service pack before Microsoft started issuing service packs.)
Many users upgraded to Win98 SE from Windows95, Windows 3.1, and DOS.