I wanted to use the following pandas, but could not import it at all.
https://github.com/pydata/pandas/releases/download/v0.15.0/pandas-0.15.0.win-amd64-py2.7.exe
Maybe you should try: pip install pandas (btw, you should install pip first).
This happened to me when upgrading google-api-python-client to a version higher than 1.2.0. The problem is in Pandas, but it has been fixed: https://github.com/pydata/pandas/commit/403f38da35ab04d3997f61db3c98134fe02910d3
The solutions is to either downgrade google-api-python-client, fix the lines in pandas yourself or wait for pandas 0.15.1