OK this is from my iPhone so it will be brief. FO3Edit can be downloaded from nexus, you follow the instructions. Download it and decompress it then control and drag it to your fallout 3 directory to copy it then following the instructions rename it FO3MasterUpdate.exe, copy again and rename the next copy FO3MasterRestore.exe and a 3rd time keeping the original name. Double click the masterupdate, it scans your data folder and will tell your problems or just say finished. Based on errors with master update you can tweak your load order, if it finishes and you have a set load order launch FO3Edit let it scan your data folder it takes a few minutes, when done right click in the left side of the window and select create merged patch close FO3Edit and open FMM scroll to the bottom and enable your merged patch having it load last.