Yeah, we kept our old computers instead of getting rid of them. Ours from the 90's is an actual tower, but everything else bought new was a laptop as they took less space. I'm not sure if everything is still running properly but I'm planning to test it all out again and have it set up to actually use. It's been years since I've played old games properly on actual old PCs.
To the original topic, it's kind of hard to think of Windows XP specific games that run well. It's hard because I found Windows XP barely ran well on it's own.