Thank you, Fallout3 on H: finally works again. I had problems with XLive before. The plugins are loaded by H: as they should be. Renaming the EXE to H: has no effect on my Game on C: C;\Spiele\Fallout3 H;\Spiele\Fallout3 and FOMM FOMM: System. NullReferenceException: The object reference was not set to an object instance. But FOMM is not important, it is only needed to open or edit the ESP. I prefer to install mods myself. I had the Nexus Mod Manager installed before, after a mistake I uninstalled it again. I don't know if it has anything to do with the problem. I'm copying Fallout H: to C now: Let's see if it works out. :wink: Edit: Fallout 3 on H: runs now without problems, no idea why it works. Fallout C: I first renamed it, then moved it to my USB hard drive as a backup, so that the error doesn't occur again. Thx Aki 57