MikTeX 2.9 Installation fails due to "initexmf.exe"

Hi, everyone

I am now installing MikTeX 2.9 in Windows 8.1 64bit. The setup log shows an
error below:

"""
An error occurred:
  source file: Libraries\MiKTeX\Core\Process.cpp
  source line: 305
  message: The operation failed for some reason.
  info: C:\MiKTeX 2.9\miktex/bin\initexmf.exe
"""

The solution from Internet is mainly about the conflicts with Adobe Reader.
I have uninstalled, and the ".pdf" key has assign full access to Admin, but
these didn't work.

How can I fix this problem.

Regards,
Lixing Zhu
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