32-bit programs can be run on 64-bit Windows OS except 32-bit device drivers. All 32-bit device drivers need to be update to 64-bit drivers in order to run on 64-bit environment.
Most programs designed for the 32-bit version of Windows will work on the 64-bit version of Windows. Notable exceptions are many antivirus programs.
Device drivers designed for 32-bit versions of Windows won't work on computers running a 64-bit version of Windows. If you're trying to install a printer or other device that only has 32-bit drivers available, it won't work correctly on a 64-bit version of Windows...
http://windows.microsoft.com/en-us/windows-vista/32-bit-and-64-bit-windows-frequently-asked-questions#
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