So far, I did some "googling" and only found people running windows Vista 64-bit having the same problem with other programs.
Somebody seems to have suggested to re-install ntdll.dll and to run a registry repair program.
I really don't know what the problem could be with the information you give me.
You could also try to use a compatablity mode of "Windows Vista Service pack2" on your pb12.exe.
sorry I can't be of more help for now.
regards,
Miguel L.