HELP. Trouble capturing from a NV GS55

,I have a Panasonic NV GS55 using video studio 8 to capture via Firewire. The first time I captured the audio sounded comperterised and on most scenes, there was no audio for the last 15-20 secs of the scene. I tried the same capture on a friends computer and software and it worked first time which ruled out a fault with the cam corder. I then thought there was a fault with the firewire card being a new computer (Pentium 4 3.0 CPU, 848 chipset, 512 RAM) took it back and got them to upgrade the motherboard to 865 chipset with onboard firwire port). The same occurred. I also tried capture using the media player stream capture and the same occurred. Is there a setting for the firewire port? The sound is recording at 16 bit. I am running XP SP2 Home edition on the PC. My friend was running XP Pro. Could the OS be the problem?