There's no problem leaving this thread open so please take your time and perform any tests as and when you've got time.
In the meantime I will attempt to find any known issues between "The Three Musketeers" and Windows Updates / BIOS updates. This may prove fruitless unless we can lock it down to a specific update.
EDIT: Do you know if the Windows Update was the usual OS security update etc or was it a driver update for any of your hardware?
Verifier.exe can be used to try and identify driver problems, however I would suspect that "The Three Musketeers" would have to be running to give a true test. Maybe try "One Musketeer" at a time and see what happens.