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Changes between Version 17 and Version 18 of InstallWindowsSvn

-                      v17
+                      v18
 We use {{{python}}} as our programming environment together with a number of standard python packages such as {{{numpy, scipy, matplotlib}}}.  One of the easiest ways to install all the required packages (except for {{{netcdf}}}) is to use a distribution like {{{python_xy}}}.
 So first install [http://code.google.com/p/pythonxy/ python xy]. This will be a large download, maybe 300 MB,  but will provide an almost complete installation of {{{python}}} for our needs.
+So first install [http://code.google.com/p/pythonxy/ python xy]. This will be a large download, maybe 300 MB,  but will provide an almost complete installation of {{{python}}} for our needs. You should probably remove any other version of {{{python}}} and {{{mingw}}} that may be on your system.
 Be sure to choose the {{{python 2.7}}} version. This is the version for which we are developing.
+At the moment {{{python xy}}} is only 32 bit, but there seems to be a promise that a 64 bit distribution is not too far away. There a 64 bit python distribution package from Enthought, but is free only to academic users. So at present we recommend {{{python xy}}} and 32 bit.