Do You Love the Ubuntu operating system, but you dont want to remove windows from your computer , there’s a way to multiboot Ubuntu and windows both on the same computer by using this tool that is called Wubi , Wubi can install ubuntu on your pc without removing the windows operating system from your computer .
1-Go to the Wubi website and download the Wubi installer
2-From your download folder, double-click Wubi and let it run. If you’re prompted by User Account Control, obviously click Yes.
3-Go ahead and pick the options you want. And be sure to enter a username and password before clicking Install.
At this point (before you click Install), you have two options. You can let Wubi download the Ubuntu disk image file for you, or you can make sure your own Ubuntu .iso is in the same directory as the Wubi installer.
4-Wait for all the processes to finish.
5-You’ll be prompted to reboot when the processes finish. You can reboot at your convenience or right away.
It was so quick I couldn’t take a screenshot, but you may see some text appear briefly on a black screen right after you reboot and get past the BIOS screen. That’s fine. Just wait for it.
6-This first time you boot into Ubuntu, you may notice a progress bar for Ubuntu installing itself. This will take a while (maybe another 10 minutes), but it will involve no user interaction
7-When the installation is finished, after you reboot, you’ll have the option to select (with the Up and Down arrows on your keyboard) whether you would like to boot into Windows or Ubuntu. You have ten seconds to pick an option, but the default will be Windows.
Download wubi : http://goo.gl/zzJ5v