How do I install VirtualBox Guest Additions on Windows 7? How do I install VirtualBox Guest Additions on Windows 7? How do I install VirtualBox Guest Additions on Windows 7? How do I install VirtualBox Guest Additions on Windows 7? How do I install VirtualBox Guest Additions on Windows 7? How do I install VirtualBox Guest Additions on Windows 7? How do I install VirtualBox Guest Additions on Windows 7?