Step 1: Go and download the wubi installer, open wubi installer; type the user name and password then click on Install.
Step 2: Installer will start to download the file, sit back for a while.
Step 3: Once all over, it will prompt you to restart.
Step 4: After restart you will find the Ubuntu in boot menu screen, select Ubuntu.
Step 5: You will get a login screen, enter you user name and password that you have created before (Step 1).
That’s All. You have successfully installed Ubuntu 11.10 along with Windows 7.
Extras: If you would like to uninstall Ubuntu, go to Start ——> Control Panel —–> Programs and Features and Select Uninstall Ubuntu from list. Click on Uninstall to remove Ubuntu 11.10 from your system.