Question:

Do 64-bit operating systems support 32-bit software? Will my 32-bit stuff work on a 64-bit computer?

Answer:

As more and more computer systems come with 64-bit processors by default. Here are a few simple facts:

• A 64-bit computer can run a 64-bit operating system, naturally
  
  
• A 64-bit computer with a 64-bit OS can run 64-bit programs
  
  
• A 64-bit computer can also run a 32-bit OS
  
  
• With either a 32-bit or a 64-bit OS, a 64-bit computer can run almost all 32-bit programs
  
  
• A 64-bit computer with a 64-bit OS cannot run old 16-bit programs

You will probably find the occasional 32-bit program that has a compatibility problem with 64-bit Windows. Often you can get around this problem by running the application in a 32-bit OS inside of Microsoft Virtual PC.

Much more commonly, though, you'll find that older printers and other peripherals don't have 64-bit drivers. It really doesn't pay for the printer vendor to spend time and money creating a 64-bit driver for a model they're no longer selling. A virtual PC won't help you here. If there's no 64-bit driver you just can't use that peripheral with a 64-bit operating system.