Try the steps described here.
Edited by Athelbras, 23 October 2013 - 03:44 PM.
Edited by vojteek, 25 October 2013 - 03:42 PM.
Is the game installed into the default Steam area under \SteamApps\common\, did you copy the FNV4GB files into the top level game directory, and did you try running as Admin to bypass access blocks?
Try the steps listed here.
Edited by Athelbras, 25 October 2013 - 11:38 PM.
Edited by Athelbras, 26 October 2013 - 04:07 AM.
Edited by Highwayman300, 27 October 2013 - 12:57 AM.
Edited by Athelbras, 27 October 2013 - 02:21 AM.