How can you find out if your version of Vista is 32 or 64 bits?

When you install windows 7 on your old computer, you need to find out your current OS running on 32 or 64 bits. Here is what you need to do to find out:

Hold down the left Windows key and press Pause/Break. It is on the screen
under the System section and says whether you are running a 32 bit or 64 bit
operating system.