AUdio ok when playing on JVC GC-PX100BE, only noise when playing on PC

Hi,

When I play a clip on the camcorder, the audio is ok; when inserting the SD Card (SDHC I Extreme by ScanDisk) into the slit of the PC as well as connecting to PC via USB cable, there is only noise.

What may be the reason?

Thank you for every hint

Regards

Aloha