using 32-bit programs on 64-bit Windows
There have been some reports that some programs could not be installed on a 64-bit version of Windows...
"Many programs designed for a computer running a 32-bit version of Windows will work on a computer running 64-bit versions of Windows without any changes. However, in some cases there might be differences in performance. If a 32-bit program uses embedded drivers, the drivers might not work in the 64-bit environment..."