Windoze just doesn't seem to be capable of it.
You want to upgrade a PC's processor; so inevitably, the motherboard and memory have to follow suite. You try to boot the PC and it goes into a reboot-loop.
This has happened a few times recently and each time I end up reinstalling Windows. Not that I mind too much, Windows seems to need regular reinstalls to stop it from seizing up altogether.
Linux seems to handle new hardware a lot better, although it's always possible to boot into a low run level (a rather extreme equivalent of Windows Safe Mode!). You just don't get the Windows clog-up problems with Linux, as applications' settings aren't all installed into one bloated registry file.