At this time not all Celestron software and USB drivers are compatible with 64-bit Windows systems. If your product is one that is not 64-bit compatible, you need to know what version of Vista you are using. To determine whether your version of Vista is 32 or 64 bit, open Vista, press the Start button and choose Control Panel. Then you’ll see the Welcome Center. Click the "Show more details" button in the upper right corner.
At the bottom of the information displayed on the next screen you’ll see System and System Type. System Type will be either 32-bit or 64-bit.