Assuming you are using windows... Open a command prompt and browse to the folder where you unzipped the tar.gz For example: cd c:\python26\xlwt-0.7.4\ Or if you are in Windows 7, browse to that folder, hold down shift and right click the folder, then select "Open command window here" In the command prompt, type "setup.py install" without quotes and hit Enter. C:\Python26\xlwt-0.7.4>setup.py install The script should then install the libraries. Now you can open the toolbox provided in ArcGIS and run the script like you would any other.
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