I have a Dell Dimension 9200 that i got one week ago. When i got it i installed Windows Vista Business (32-bit). After that I entered the BIOS to enable my second hard drive and i noticed that it stood "64-bit thechnology enabled yes" and I wonder what that means.
Just means that the system hardware is able to run a 64-bit operating system. You'd have to install a 64-bit OS to actually take advantage of it.