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Eclipse: When downloading Eclipse distributions, there are specific downloads available for 32 or 64 bit systems.  Note Note that for Windows, only limited Eclipse distributions offer a download for 64 bit Windows.

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The Eclipse.org download page (http://www.eclipse.org/downloads/) lists a wide range of prepackaged Eclipse distributions. See [http://www.eclipse.org/downloads/packages/compare-packages|http://www.eclipse.org/downloads/packages/compare-packages] for for the overview of what each Eclipse distribution contains. 

One of the offered distributions that includes PDE is the Eclipse Classic distribution. Although the plugin development tools can be installed in any Eclipse environment, the easiest is to download the 'Eclipse Classic' distribution and install it.

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