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I installed Windows7 on VirtualBox but the even in fullscreen the screen of the virtual machine remains small.

I can't seem to be able to adjust it. Is there any way in the settings to make it 1280x800 resolution?

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Make sure the Guest Additions are installed inside the Virtual Machine. If you have installed Virtualbox-OSE from the package repo, you can get the iso that holds the additions for Windows machines with the command: sudo apt-get install virtualbox-guest-additions-iso

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In case you installed from the Oracle repository see this answer. – Takkat Apr 4 '12 at 20:46

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