How to change 64 bit to 32 bit windows 7

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Hello luncai;
No real easy way to downgrade a 64bit OS to the 32bit OS version.
You're going to need to do a 32bit installation.

Have you thought about doing a dual boot setup? You could leave your Win7 64bit as your primary (or secondary) OS as then install the 32bit version in a seperate primary partition.

This guide mentions how to install Windows 7 and Vista in a dual boot setup. But it's essentially the same process to get a Win7 32bit OS installed as a 2nd OS on your system.
http://www.sevenforums.com/tutorials/5166-dual-boot-installation-windows-7-vista.html
 
^That is what I am wondering, why would you want to downgrade to the 32 bit version?
Many people are under the assumption that if they have a problem running a 32 bit application under Vista or Win7 64 bit, they need to have the 32 bit version of Windows. If the program will not run under Win7 64 bit, odds are it won't run under Win7 32 bit either. The issue is the newer version of Windows, not whether it is 32 bit or 64 bit. If you are having problems finding a 64 bit driver for an older device you are trying to run under Win7, try the Vista 64 bit driver, it will work most of the time.
 

simple direct answer..