At 8AM, I will reinstall windows, whether I have managed working backups or not. Three different Linuxes, a Mac, (and various miscellanoues BSDs on servers), no trouble whatsoever. Windows, operating system of the masses, and I've been trying on and off to upgrade for more than two weeks.
If you never hear from me again, it's because I shot myself in the foot, repeatedly. And the gallbladder. And probably the Islets of Langley. And the amygdala.
update: Wow, that went flawlessly. And accomplished absolutely nothing. How... something.