Windows 7 updated last night, when I got on today I got a real heart skipping surprise.
Chrome appeared to have been reset back to factory default.
Thankfully that was not (fully?) the case. I was asked if I wanted to reload the extensions, and all my bookmarks/history/etc were present afterwards. Thank god.
However apparently Chrome does not recognize that I am on the same laptop as before, adding an extra section to my recent tabs area.
Hopefully nothing else has/will gone/go wrong.