Boot Windows with Ubuntu disk in drive

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!

Additionally, I am running Windows Vista, Home Premium.

Turn off your computer. Stick a paper clip end into the hole in the cd or dvd drive face plate, take out the cd disk and turn your computer back on.

Code:

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sudo poweroff

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DVD drive should eject the disk.
When you remove it hit enter and computer should poweroff.

As everything with computers there is more than one way:

sudo shutdown -h now
sudo shutdown -r

h is halt
r is reboot
now is immediately

Thanks, it worked!=D>