Could not install Ubuntu 2.5 on my Windows 7 computer using Wubi

I have a windows 7 computer and I just downloaded Ubuntu 2.5 and I would like to use it from my Windows machine. I used Wubi to install it but an error would pop up at the end of the installation process.
"Could not retrieve the required installation files." The installation also indicates a file name to debug the error "wubi-9.10ubuntu1-rev160". Attached is the screenshot of the error message I get during the installation.

Error:
Une emeur est survenue:
Could not retrieve the required installation files.
