Dude, I'm having the exact same problem, although my data folder still exists, when I click on it, all it shows are NAM files, no meshes, textures, etc. Same with my mods folder as well, all of my mods within the folder have vanished, the only one that somehow remained is Fallout Mod Manager, and when I run that, it shows that all of my mods can still run just fine, when I load the game, again, it runs just fine... So yeah, I'm confused so any help would be greatly appreciated