in your users\username\documents\my games\fallout 4\saves is where the savegames should go. If they vanished, google Virtual Store Location to figure out where they potentially went. You can use the console command 'forcesave' (without quotes) and see if that ends up doing anything. It sounds like a permissions issue. if it's lreated to that a good hint/habit with games is to make sure it's placed in a custom folder. for example, instead of C:/program files (86)/etc make a new steam save location like C:\games. When you start the game installation in steam, at Choose Location, use the dropdown to create a new location. (it will probably say another drive but you can change that afterwards), Create a new folder as high/root as possible (like C:\Games) so you can forever rule out any permission problems with games. Whenever you post something like this, be sure to supply your operating system and any other important details like if you experienced similar things before, etc :).