Configurating and Installing Python 2.7 (Optional)

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Click Finish

System Properties

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Environment Variables

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Set the system’s PATH variable to include directories that include Python components and packages we’ll add later. To do this:
Right-click Computer and select Properties.
In the dialog box, select Advanced System Settings.
In the next dialog, select Environment Variables.

Edit System Variable

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In the User Variables section, edit the PATH statement to include this:
C:\Python27;C:\Python27\Lib\site-packages\;C:\Python27\Scripts\;

Command Prompt

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Type python to verify that it is working.

Installing and configuring VirtualBox 4.2 for GNS3 0.8.3

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Download a copy of the virtualbox from Virtualbox.org. If you are running GNS3 0.8.3, the recommand version of the VirtualBox is 4.2 and above.
Double-click on the VirtualBox setup file and click Run to continue the installation.

Virtualbox 4.2 setup

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Click Next >
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All the features are selected to be installed and the default location will be used for the installation. Click Next >
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Click Next >
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Click Yes
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Click install and Always trust software from "Oracle Corporation".
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Click Install
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Oracle VM VirtualBox Manager

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Close the VirtualBox Manager

Under the GNS3

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On the menubar, click Edit, select Preferences...

VirtualBox Preferences

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Under the VirtualBox, click Test Settings
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The message will display that the VBoxwrapper and VirtualBox API 4.2 have successfully started.