Most newer games do not support XP. XP can not use Anything over 3 gb of memory unless you can find XP 64 which was a horribly buggy OS.
Windows 7 was good for gaming Windows 10 is really good for gaming after you spend a couple days setting it up and disabling 90% of the integrated bull shit.
That being said What do you not like about Windows 10? Just the Start menu thingy?
If that's all then go Download Classic Shell start menu.http://www.classicshell.net/ Makes it look and feel like XP or Win 7 depending on how you set it up in the Classic Shell options.
My desktop with Classic Shell. Heeeeeehaaaaaaaawwwww lol
Ignore all the stuff on my desktop.It's a mess but I know where everything is.