When you run a 32-bit program on a 64-bit version of Windows 7, the program runs in a 32-bit emulation mode, using software to simulate a 32-bit version of Windows 7. This allows 32-bit programs to run smoothly on the 64-bit operating system. But note that programs designed for 64-bit computing might run faster on a 64-bit version of Windows 7.
Certain older programs that won't work on a 64-bit version of Windows 7 might run fine in Windows XP Mode in Windows 7. As the name suggests, this feature allows programs designed for Windows XP to run smoothly in Windows 7. (Some types of programs might not run in Windows XP Mode, such as security software and programs with intensive graphics.)
For more information, see Install and use Windows XP Mode in Windows 7.
You can also try changing the compatibility settings for the program, either manually or by using the Program Compatibility troubleshooter.
For more information, see Make older programs run in this version of Windows.
The bottom line: Unlike hardware drivers, even older programs designed for 32-bit versions of Windows should work well with the 64-bit version of Windows 7.
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