Wubi is an officially supported Ubuntu installer for Windows users that will bring you into the Linux world with a few clicks. Wubi allows you to install and uninstall Ubuntu as any other application. If you heard about Linux and Ubuntu, if you wanted to try them but you were afraid, this is for you.
Wubi is Safe
It does not require you to modify the partitions of your PC, or to use a different bootloader.
Wubi is Simple
Just run the installer, no need to burn a CD.
Wubi is Discrete
Wubi keeps most of the files in one folder, and If you do not like, you can simply uninstall it.
Wubi is Free
Wubi (like Ubuntu) is free as in beer and as in freedom.
Wubi Website»
If you want to access your NTFS Windows drives follow these instructions:
1. Make sure you have internet access (see the network icon on the top right)
2. Open the "Applications" menu and select "Add/Remove..."
3. In the listbox on the right select: "Show All Available Applications"
4. Search for "NTFS" and select "NTFS Configuration Tool". Click OK to install it
5. Run the configuration tool under Applications > System Tools > NTFS Configuration Tool
6. Select "Enable write support for internal device". Click OK to set it up.
7. Once you reboot you will find your windows disks under /media (you can access that from Places > Computer > File System > media).
http://ubuntuforums.org/showthread.php?t=396629