[Osiris]

Source Install Guest Additions for a better VirtualBox experience

In my last two articles (Installing Windows XP as a Virtual Machine on VirtualBox and Installing and configuring VirtualBox for virtual OSes) you saw how easy it was to install VirtualBox and then install Windows XP as a virtual machine. The implications of this software are only as limited as the imagination of the user. But there are instances where the install might not look or feel exactly as you would like.
In my default setup of Windows XP, on my particular Ubuntu 9.04 box, the installation of Windows XP rendered a perfectly usable desktop with 32 bit colors in 800×600 resolution. This resolution, of course, is not ideal for some situations (such as Full Screen mode). In order to get a higher resolution, along with other features, you have to install Guest Additions. This is a simple process that can be done quickly and yields a much better user experience than the default. So…let’s get to the installation.