Actually, Windows ME was the "worst". I had minimal problems with 98SE at work and home. Upgraded to XP at work about a year ago with purchase of a new PC, and just in the process of doing the same at home.
98SE was a non issue and I mis-posted my dislike. I also ran 98SE before my XP and liked it. I was brain-fried witth ME and have never gotten over it.:-)