I went to do a simulation for an upcoming flight in about four weeks. Nice flight to over 40k' but I need to get the paperwork submitted ASAP. I fired up the simulator only to find that my sim file was not accessible. None of my three network attached storage devices were visible to any PC on my network . A few days of available time later I tracked it down to an update that was recently installed. There is a protocol that Microsoft were not happy about, so they deprecated it. The new update installed quietly and normally. After not having any activity using that protocol for 15 days the OS decided to uninstall the protocol making my entire NAS storage and files unreachable . I think the same people that write viruses work for MS. The outcomes are certainly similar. So now I have managed to talk to the drives, but have not yet set up any new NAS devices, or transferred it to a USB drive. That has to wait for now. Too busy. I did manage to get the sim file extracted and get the paperwork in, albeit at few days later than I would have liked. So, continuing the Windows Update theme, I suggest everyone, before a launch, updates their PC about a week prior to a flights, especially important ones. Then reboot, confirm a clean reboot and then turn update off until after the launch. That will save you booting the laptop out in the paddock only to have a "Windows is updating" message on the screen for 45 minutes under battery power. Trust me. I can vouch for the fact that that is not what you need for a stress-free launch. You have been warned!