64-bit versions of the Windows operating system support 32-bit applications, thanks to something called "emulation." Though a 32-bit application would not inherently work in a 64-bit operating system, Windows makes this possible by making the program "think" that it is being opened using a 32-bit operating system. Therefore, if you want to convert your copy of Windows 64-bit to 32-bit to run those applications, all you really need to do is run the application. Windows will perform the conversion and take care of the rest.
Step 1
Click "Start."
Step 2
Select "All Programs."
Step 3
Open the folder that contains the shortcut icon for the 32-bit application you're trying to run. This will expand the folder into a listing of icons beneath that folder.
Step 4
Click on the shortcut icon for the 32-bit application you're trying to run. Windows will start the emulation process, which will convert a portion of your operating system to 32-bit architecture. The 32-bit application will then load inside that portion of Windows and will display properly on screen, as if you were running a 32-bit version of the operating system.