You appear to have a damaged installation of xlwt ... Column.py is from the latest (0.7.4) version but BiffRecords.py (which contains the ColInfoRecord class being instantiated by the above code) can only be from an earlier version. I suggest that you delete every file in C:\Python27\lib\site-packages\xlwt, then get version 0.7.4 from PyPI (http://pypi.python.org/pypi/xlwt/) and install it.