How to Install Ubuntu on Windows?
Solution 1:
To install Ubuntu, first you need to burn the ISO that you downloaded to CD. To do so see Burning ISO How to. Once that is done, you need to boot from that CD, and make sure that your system is set to boot from CD. Once it boots, you will have the option to install Ubuntu alongside windows, and that way you have both Ubuntu and Windows on the same machine. A second way, is to install Ubuntu from within Windows, just like any application, by running wubi.exe from the CD. For more information on how to install Ubuntu you may check out Installing Ubuntu Desktop or Welcome to the Ubuntu installation guide!
Solution 2:
You can always install from within Windows with WUBI.