I have been very stupid and dove into Ubuntu without knowing anything about it. I inserted the disk described in http://www.ubuntu.com/desktop/get-ubuntu/download without Linux. I want to know how to get out of the command prompt and enter Windows so I can eject the disk and reboot my system. Please note, if you view this post that it is time sensative and I really need to get started on a report. Thanks in advance, Ububtu Community!