I'm a completely new user of Linux and since my computer is not a good machine I wanted to install 32 bit OS, I downloaded ubuntu desktop for 32 bit but when I check in system settings under details it says my OS type is 64 bit, I downloaded it from the site http://www.ubuntu.com/download/desktop choose Ubuntu 12.04 LTS and set it as 32-bit (machines with less than 2GB RAM).
Ubuntu download page defaults to 64-bit images. Most likely you just pressed download or pressed the wrong button:
If you change one menu, and click the other button, it will defaults to 64-bits.
If you don't trust that, you can verify the file sizes:
You can also use hotlink:
Or go directly to http://releases.ubuntu.com and download your image.