My first exposure was a Windows 98 computer around 2002 (i was ten at the time). I got to play classics like Prince of Persia, Commander Keen, Jazz Jackrabbbit, Duke Nukem, Doom + other sharewares. My favorites was the point and clicks like King's Quest, LucasFilms stuff and The Longest Journey.

Edit: I'll add Willy Beamish as another favorite