Ya know, some experts recommend you reboot your Windows machine once a week to clear out memory leaks and other problems that build up over time. I am a big Linux fan and feel you shouldn't have to do that to a server. But this is starting to look a lot like past outages when I hear the machine isn't coming back from a reboot and we then find major corruption of the disk volume... Again, I hope I am wrong but I have seen this too many times.
At least this time I have full and recent backups