Merredith bought a laptop several months ago with XP preinstalled but was eligible for a Vista upgrade DVD to come in the mail at a later date. So the DVD arrived with plenty of warning: "For Toshiba computers only." I put the disk in my desktop machine and upon autoplay a dialog box shows up saying, "For Toshiba computers only." Just for the heck of it I ran the setup program direct. Long story short I have Vista installed on my desktop.
Not that Vista is anything worth mentioning, but the lame attempt by Toshiba to keep people from putting that Vista upgrade on anything but Toshiba product was awesome.