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.