Excellent game , but someone pls help me

User Rating: 9.6 | Myst V: End of Ages PC
My bad luck is that i have dyscovered this game far too late , anyway i have purchased the whole saga but i can not play the first two releases on Xp. and what's the deal with URU-Ages Beyond Myst ? Dose it have to do anything with the Myst saga? and if it does with what i am supposed to begin with , logically with Myst I but it's impossible to run it on Xp. IS it possible to start with Myst Exile?

This is a great game, the gameplay especially and the story as well. I am somehow confused by what's happening in this game , that's why i am seeking for help, and am not going to play this fifth game becouse i don't want to spoil the story, so please help me with this.

Cheers