Sound comes from mic during capture from sony camera to a file with Ulead

I have Sony camera with DV tapes conected to a pc through usb cable.(Fire wire not working on the camera).
Software used: Ulead video studio 11 plus.
OS windows XP…Camera detected in the Ulead menu.
Camera is in playbackmode.
The problem is: while in play back mode the sound on the camera is ok but when i view the captured video, there is a sound that recorded like one that is cumming from camera microphone.
IF i am doing full volume on a pc or finished dvd i can heare the original sound from a recorded clip but very very weak.