Install Guest Additions
When you first run Windows in VirtualBox, some features won't work correctly. The keyboard and mouse must be "captured" to work in the virtual machine and must be "released" (by clicking the left-hand Command key on your keyboard) to function in Mac OS X. Screen resizing, network connections, file sharing, and other features won't work either. To remedy these problems, install the special VirtualBox drivers for Windows, known as the Guest Additions:
Choose Devices > Unmount CD/DVD-ROM.
Choose Devices > Install Guest Additions.
The Guest Additions installer runs.
Follow the prompts to complete the installation. You may see one or more alerts stating that some component hasn't passed Windows Logo testing; if you do, click Continue ...
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