If games PC games that are so old you need to run them in DOSBox count, then The Elder Scrolls: Arena (1994). Else, probably Psychonauts (2005) or something around there. I have some older games from the XP era, but I just have them on disks rather than installed.
"A man is nothing but his mind; if that be out of order, all's amiss, and if that be well, the rest is at ease." - Girolamo Cardano