what i did today and made it working (win 7 x64, works on x32 as well)
(first of all go to C4D R13 > Help > Personalize, and copy your key to somewhere)
1º Copy the VrayBridge Folder, from my C4D R12 plugin folder to C4D R13.
2º Open the XFORCE crack a paste your key, and choose your output folder (C4D R13 Root folder, not maxon's, C4d R13).
3º go to your VrayBridge Folder inside C4D R13 > Plugins, and copy the content
, not the folder, inside your Libs64 to C4D R13 folder.