I'm new to Ubuntu (and Linux in general), so bear with me.

I burned Ubuntu 13.10 to a DVD and "tried" Ubuntu. Then in the Ubuntu desktop, I selected the install icon for Ubuntu. I got a prompt that gave me the option to (1) install Ubuntu inside Windows 7, (2) delete Windows 7, or (3) choose another option. I chose to install inside Windows. After that, the screen went dark, showed the installation progress, and prompted me to eject the DVD and press Enter. After doing that, my laptop restarted but booted, just as usual, automatically to Windows. I can't figure out how to boot Ubuntu now without putting the DVD back in.

I've tried looking for Ubuntu as an installed program on Windows but it doesn't show up, except for CyberLink Power2Go. My system BIOS has DVD at the top for booting, followed by my HP Notebook hard drive, and "Internal Network Adapter Boot" is disabled. At this point, I'm not sure what else I can do. I'd really appreciate any help you can give me.