Games old & new that I simply installed and played on WinXP without any special settings, tweaks, programs etc include ~
Amerzone, Discworld Noir (plays fine aside from loading quirks), Broken Sword 1, Curse of Monkey Island (MI3), Escape from Monkey Island (MI4), original release Myst, original release Riven, original release Exile, Riddle of the Sphinx (did have one problem in Gil's tent but nothing I couldnt get past), Mystery of the Nautilus, Return to Zork, all Nancy Drew titles, Infocom text adventures, Tony Tough & the Night of the Roasted Moths, Uru, Syberia, Syberia 2, Omega Stone, Schizm aka Mysterious Journey, Putt-Putt titles, Freddy Fish titles, Pajama Sam titles, Spy Fox titles, Mysterious Journey 2
The Arthur's Knights demo ran okay on winXp so that's another one!
Games that played okay on WinXP for me (without emulators or tweaks) but had major sound problems~
Eric the Unready, Freddy Pharkas, Secret of Monkey Island (MI1), Monkey Island 2:LeChuck's Revenge, Maniac Mansion, Discworld 1, Discworld 2
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More games worked on winXP by using the compatability tab under properties which you can get to by right-clicking the game's icon
(ie realMyst) &/or Inferno's helpful suggestions.
& some barely ran at all ~ even basic gameplay greatly benefitted from helpful programs like ScummV & DosBox (ie Simon the Sorcerer 1 & 2). (These often fix the sound problems too!)
Other old(er) games we played on our cranky 98se machine or zee elderly Frankenstein ~ so we havent tried them on the newer machines as yet.
Hope thats helpful to you
Susan