if you want to play dos games get these to things (a dos emulator and a frontend for xp for it)
DOSBox - the dos emulator
http://dosbox.sourceforge.net/news.php?show_news=1
d-fend v2 - the front end
http://members.home.nl/mabus/dfend.htm
just install dosbox, remembering where you put it.
then install d-fend and it will ask you where dosbox is.
use the setup wizard to add a profile. each game can have its own settings, you can even change the speed you want the game to run at.
i love most of the games already talk about. you could try little big adventure 1/2, cant remember if its mouse based, but it is a adventure game.
edit: you just need to run d-fend anytime you want to run any of the games.
ive managed to get monkey island, descent 2, 1869 and other games running on it, its pretty easy to use.