As stated by jaymac connecting your camcorder to PC is best done via a firewire (aka iLink, DV port, ieee1394) connection. The vast majority of software for editing will work best (and some only) with firewire for capture. However your camcorder should have been supplied with the MotionDV Studio 5.3E LE software that is designed to capture the footage via USB. In most cases camcorders are also supplied with USB and analogue video/audio leads so it looks like you didn't get everything that should have been in the box. The manual should list what should have been in there. If bought new and things were missing then I suggest you go back to where it was purchased and get the missing items. If bought second hand then the chances are you can download the software from the Panasonic site and finding a USB (but still suggest you go for firewire) lead to get the footage onto your PC should be easy enough.

Type: Full HD Dashcam System requirements: Mac OS x 10.3.6 above,Win 7,Windows 2000 / XP / Vista Max External Card Supported: TF 32G (not included). The instruction book refers to MotionDV Studio 5.3E LE. To your pc via windows movie maker which you will have if you are running XP.