GuardsmanTheExecutioner

My Dawnguard is apparently the one that isn't working, but instead of crashing, my skyrim's continue/new/load buttons do not appear, and if I alt tab skyrim goes black. Here is the exact log from Tes5edit saying Dawnguard is the error : Background Loader: Fatal: <Exception: "Dawnguard.esm" requires master "Update.esm" to be loaded before it.> I moved update.esm in front of Dawnguard, but the problem still occurs. NMM Crashes whenever I try to uninstall a certain mod btw,