How do I play older (32-bit) games on a 64-bit Windows XP?

I have some of my old games that I'd really love to play again, such as (and don't laugh!) Morrowind, The Curse of Monkey Island, SimPark/SimSafari, Riven, and a few others that aren't coming to mind. I love these games and would like to play them again, but as I run the install.exe, I get this message: "The version of this file is not compatible with the version of Windows you're running. Check your computer's system information to see whether you need an x86 (34-bit) or x64 (64-bit) version of the program and then contact the software publisher." Please, if you can help me at all it would be great. PS, I'm not really a tech genius, I only understand basic and moderate computer lingo, so try and put it in detail for me :)