I have lost my Skyrim.bsa file. After 2 complete clean reinstalls, it still isn't there. I can't run Skyrim with a single mod or it CTDs before the menu screen pops up. I have Skyrim, legally, on Steam. I have verified the cache integrity many times. I have restarted Steam, computer, both, virus scanned, defragged. As stated before, I did one quick uninstall/resinstall, and two full, clean reinstalls. On 2 different drives. I have my Skyrim.esm. But no .bsa. I can play, but with no mods whatsoever. I have contacted Bethesda. I have contacted Steam support. I have scoured the web. You are my only hope.