If your Windows 7 was pre-installed in your PC you have to contact your computer's manufacturer and ask for a Windows 7 32 bit copy (I don't know if the OEM license include this type of support); otherwise, you have to buy a new Retail license of Windows
7, where you will find both the 32 bit and the 64 bit version.
Bye.
Luigi Bruno - Microsoft Community Contributor 2011 Award