you probable have, but have you make sure you have deleted all your old files from your pc, document folder, local files folder and so on ?? cause just uninstall can left old files in place. if you are not sure, right click windows icon , click run, type regedit , then edit, find and type Fallout 4 if it finds files there you can see where , go to the appropriate folder it indicates and delete the files. if you know what you are doing you can delete then from regedit direct