The Ubuntu installation is pretty straight forward. Just boot from the Ubuntu CD (if you can't figure out how to do that you need to press F2 or whatever the key is on your computer that displays right when it turns on "Press F2 for Boot menu" or something along those lines and choose the CD drive). Load the OS and start the installer.
From there you pick a language keyboard and so on. When it gets to the part where you choose where to install the OS, you can either have it make everything for you and it will resize your Windows partition (may take a long time) and create one for Ubuntu. If you would rather do it manually, click advanced and you will see a display of the partitions on your drive.
You will have to resize the partition you want to make smaller (Right-click and resize) then right click on the unpartitioned space and select new partition, make it ext4 and mount it as /. You may also want to leave room for a swap partition, if you plan on hibernating in Ubuntu especially. So leave some room, right click the unpartitioned space, make sure the size of it is twice the size of the amount of RAM you have, and select swap for filesystem.
Remember no changes will be written to the disk until you click "install" in the setup so don't freak out if you make a mistake. Once you are done, reboot and remove the CD and Ubuntu will have placed a grub http://en.wikipedia.org/wiki/GNU_GRUB menu for you to choose to boot to either Windows or Ubuntu.
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