Windows update is the devil. Just wanted to get the Framework, but it enticed me with what I thought would be updated drivers for my modem, which has always acted a little funny. So I wait 2 hours, get a speech bubble about new network thingamabob's that I should configure, get confused, click the X to close the bubble, which turned out not to be for closing the bubble at all but actually crashing my computer right in the middle of the update, sending everything to hell once I rebooted. Oy.
System restore is your friend. Now, if you'll excuse me, I have a 2 hour download to download a second time. >:/
EDIT: Whoo, apparently not! Windows new it already downloaded. Yay.