If you want to use the USB cable to connect the Camera to the Computer to transfer the video to the Computer then:
(Applicable for Vista Operating System Only.)
This Camcorder does not support USB streaming with the VISTA Operating System. Use an i.LINK cable to transfer the video to the Computer. The i.LINK port is also called IEEE 1394 or Firewire port. (An i.LINK is a black D shaped connector with 4 or 6 pins. The type of cable to be used will depend on the i.LINK port of your Computer. The Sony Camcorder will have the 4 pin i.LINK cable and if the computer has the 6 pin i.LINK port, then you may have to use the 4 pin to 6 pin i.LINK Cable).
You can use any video capturing software like Windows Movie Maker to transfer the video from the Computer.
Refer this Link
for the instruction to transfer the video to the Computer using i.LINK cable.http://www.kb.sony.com/selfservice/documentLink.do?externalId=C111893
NOTE: As the Camcorder does not support USB streaming with Vista, it is not required to use any Sony Device Driver to transfer the video to the Computer. You do not require any Drivers or Software from Sony to transfer the video from the Camcorder to the Computer using the i.LINK/Firewire interface.
(Applicable for Windows XP Operating System only):
If you are using a Windows XP Operating System then you have to install the USB Streaming Driver in the Computer from the supplied Software disk with the Computer.
Check this Link
for the instruction to transfer video to a Computer using USB Streaming.http://www.kb.sony.com/selfservice/documentLink.do?externalId=C222820
If you do not have the supplied Software disk then I suggest that you use the i.LINK cable to transfer the video.
If you are using an i.LINK cable then:
The Camcorder will flash the DV IN message as soon as the i.LINK/Firewire cable is connected to the Camcorder.
If you are getting the DV IN message then it indicates that the Camcorder recognize the connection.
If you are not getting the DV IN message as soon as the i.LINK cable is connected with the Camcorder then the issue may be with either the Camcorder or with the i.LINK cable.
Try resetting the Camcorder or try with different i.LINK cable. Locate the RESET button behind the LCD screen of the Camcorder. (You will be able to locate the RESET button by opening the LCD Screen. The Camcorder should be switched ON when you reset the unit. Press the RESET button using a sharp-pointed object).
NOTE: Resetting the Camcorder will reset the settings of the Camcorder to the factory settings including date and time. It will not delete any data saved in the Camcorder.
If the issue still persists after resetting the Camcorder and with different i.LINK cable then your Camcorder requires service to resolve the issue.