When i open the fallout 3 Launcher, it wont let me click Data Files. and it says 'INSTALL' rather than 'PLAY' Despite the fact its allready installed. i can still play *i made a short cut straight to the game file* but i want to add my DLC. and i need to access the data files option for that. is there anyway to get the "PLAY and DATA FILES" Launcher Back, or to access the Data Files Option ingame? all help Appreciated

i am running the GOTY on Windows XP btw

You could use the http://www.fallout3nexus.com/downloads/file.php?id=640 (if you are running many mods, you should run it anyway).