GoCryptic

disabling your antivirus actually work man. thank you. almost ripped my anus in half trying to get this fix There it is finally! I was looking around the fallout options in nexus mod manager and all the directories there had plenty of space. Your comment made me realise I had missed something. So the steps are: 1: Click the cogwheel icon in nexus mod manager. 2: Click the general tab (first one, the options dialogue should open on this tab) 3: At the very bottom, the last option is the temp directory that NMM uses to extract a mod when it is installing it which defaults to system directory---> change this directory to somewhere that you have at least 10GB (excessive but hey!) of space. You won't have this problem again.... unless you install a mod that is 11+ gigabytes. But if you do, then you know what to do... Edit: Don't know what's going on, meant to quote MatjaX. Also forgot to mention that you need to restart NMM after changing the directory. You sir are a hero!