Probably Number Munchers or one of those other edutainment games. The ones I remember in middle school were the Oregon Trail and this one where you're a slave that has to escape. I think it was called Freedom. First game I probably played for the PC that wasn't in school was Where in the USA is Carmen San Diego. It was on a disk or cd that came with a ton of games (some of them not very appropriate! lol).
Not much of a pc gamer though.
Not much of a pc gamer though.