This network problems relates to when Windows 7 is no longer being supported. I would like to keep an older operating system (Windows 7) on my network as I have one program that doesn't work on Windows 10. This computer doesn't need to have access to the internet but does need to communicate with the other computers on the network. So my plan would be to disable the internet connection on this system (by deleting the gateway) and staying with Windows 7 and then upgrade all the other computers on the network to Windows 10. Would my network be safe longer term having this one windows 7 machine?