Tiny XP [Warning: Porn ads] is a stripped down yet simultaneously beefed up version of XP that includes almost all the drivers necessary to run on almost any hardware as well as a number of registry hacks that ensure that the install won’t bog things down.
Is it legal? No, but it’s basically a sysadmin’s godsend. It even includes a tiny copy of Linux for boot-time troubleshooting. “Tool” implementations like this have been around for years and their absolutely crucial for regular troubleshooting. It’s actually interesting: this version basically acts like a powerful Linux install, once the go-to tool for most sysadmins. How the worm has turned.