My game crashes when I start it using Skyrim Script Extender (SKSE), Steam, TESV and SkyrimLauncher. Computer Specs BOSS Log What I have tried: Deactivating mods one at a time using NMM. When I tried to deactivate the Unofficial Dawnguard Patch, NMM crashed. Now I can't use NMM to alter any other mods. Used tes5edit to clean all master files (cleaned Update, Dawnguard, Hearthfire and Dragonborn). Tried to open all plugins with tes5edit; tes5edit stopped at the Unofficial Dawnguard Patch. Tried to scan all files again with tes5edit; background loader went fatal at "AP Skyrim.esm" Error message read - Background Loader: Fatal: <EOSError: System Error. Code: 2. Everything was working fine until last night when I installed the Japan Home Purchase and Supermodel Skyrim II mods. I hope this is the right process for getting help. If not, please redirect me via PM. Thanks. Ben