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To install Guest Editions:To install Guest Editions: In this example the host computer is Ubuntu Linux and the guest computer is Windows 7. Choose "Insert Guest Additions CD Image" allows the Windows guest to think that a driver CD was just inserted into an attached cdrom drive containing the necessary driver.On the guest machine in Windows you can see that there appears to be a driver cd available.Open to browse the cd by right-click and select Open. Now locate VBoxWindowsAdditions.exe and right-click to '''Run as administrator'''. You must choose "Run as administrator" on the Windows 7 guest for the driver installer to proceed.Complete the driver installation process which will, at the end, require you to reboot the guest Windows 7 VM.