Yeah, you can start the setup within your current os, then half way through your computer will restart and carry on from the files it has copyed to the partition where you are going to install Windows 7.
Search
http://thepiratebay.com for windows 7 and download the 32bit version if you want it.
EDIT: This is how to do it if you didn't understand what I said above ;)
1. Go to
http://utorrent.com and install uTorrent.
2. Go to
http://thepiratebay.org/torrent/4475...01.DVD-WinBeta and download the torrent hash file,
3. Open the .torrent file with uTorrent
4. Let it download
(If your isp is tiscali wait a few months for it to finish downloading)
5. Download winrar (
http://winrar.com)
6. Once the torrent is finished open the folder where you downloaded it to in winrar
7. Select the .r53 and the .r58 file and click "Repair" (they are slightly damaged)
6. Open the file called win7-32bitPDC.rar and extract the iso
7. Download magiciso (
http://magiciso.com)
8. Extract the iso to your desktop
9. Open the folder where you extracted them to and run the exe file
Your computer will restart a few times while its installing. :)