Since Windows Vista doesn't support USB Streaming, it's not possible to transfer the videos to the Computer using the USB connection.
However, you may transfer the videos to the Computer using an i.Link or an AV connection.
The AV port is similar to the Composite port of the TV.
i.LINK is the same as Fire-wire/IEEE1394. It is a D Shaped connector of either 4 or 6 pins. The type of cable to be used will depend on the i.LINK port of your Computer.
However, it's required to have the Analog or the i.Link Capture Card installed on the Computer to stream Videos using the AV and the i.Link connection respectively.
It's required to purchase either a 4 - pin to 4 - pin or a 4 - pin to 6 - pin i.LINK / Fire-wire cable depending on the number of pins on the i.LINK / Fire-wire port of your computer (since Camcorder will have only 4PIN i-LINK, while the Computer may have a 4PIN or 6 PIN i.LINK port).
If your computer does not feature this port, you may contact your Computer retailer to install a separate i.LINK Capture card in your Computer.
The software and driver to be used for video transfer will be supplied by the computer manufacturer (if the computer came with an i.LINK interface) or else by the i.LINK card manufacturer.
Click on the below links to get the steps to transfer the videos to the Computer using the:
i.Link connection:-
http://www.kb.sony.com/selfservice/documentLink.do?externalId=C111921

AV connection:-
http://www.kb.sony.com/selfservice/documentLink.do?externalId=C111893