biber is still missing in the 64bit version of miktex. Could you please add it? As far as I know there is no special 64-Bit-biber and the 32-bit version should work fine (but I didn't test it). If it is not possible to include biber, could you please add a remark on the miktex download page beside the 64bit versions that biber is not included? It frustrates people a bit to "install a complete TeX/LaTeX system" and then to find out that biber is missing.