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Screen resolution only displaying 800x600 in Xubuntu

I recently created a virtual machine of Windows XP for a host computer running Mac OSX 10.6.8 However i find that the screen displayed by VirtualBox is far too small for any real work to be done. Where can i find the "Fullscreen" option? The option does not appear to be there under settings, and when i try stretching the window, it just creates a gray frame that is distracting and doesn't help anything.

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marked as duplicate by iglvzx, random Mar 14 '12 at 16:36

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Have you installed the VirtualBox Additions? –  Renan Mar 13 '12 at 0:45
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up vote 7 down vote accepted

You need to install the Virtualbox guest additions to do this. They are in the Devices menu, just hit that.

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After that, they will appear in Windows XP's My Computer. You will see that there is a Virtualbox logo on the "Disk" it mounted. Inside there will be an executable for Windows. It may also auto-run.

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Once thats done and you reboot the guest machine, you can go to Machine > Full Screen. It will also dynamically expand to whatever size you make the window, once the guest additions are installed.

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It should be noted that once you verify that "VirtualBox Guest Additions (D:)" is in the "Devices With Removable Storage Section," you have to double click it to install. –  whyoz May 31 '13 at 14:25
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You should be able to change the display resolution within the virtual XP. You may have to increase the virtual machine's video memory to be able to select a higher resolution. You can make VirtualBox fullscreen by doing [host key]-F (by default [host key] is the right CTRL key).

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This will only work if drivers are installed, the virtualbox guest ones. If not, it will not function properly and will not expand, sticking to the vesa style drivers. –  Simon Sheehan Mar 13 '12 at 0:59
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