Hi john god
No matter what I do ,I can't transfer them to my computer desktop.
What specifically have you tried? Below is a brief guide I found, have you tried this approach?
Installing VideoCam Suite
1 Insert the disk.
2 Click on "VideoCam Suite." Click next.
3 Create a folder to store the application to be installed. Click next.
4 If you want a short cut, click "yes." If you do not, click "no."
5 Choose your country. Click next.
6 Click install to complete the process.
7 Select the choice to restart your computer. Click "Finish."
8 Remove the disk.
1 Turn on the camera
2 Connect the USB cable to your camera and then to your computer.
3 Select "PC Connect." Press the joystick.
4 Drag and drop files onto your PC for still images.
For videos, press the "DVD Copy" button. Video will upload to the PC where you can save it or burn it to a DVD.
Tips & Warnings
Installing the software before connecting to your computer is recommended or you may not be able to transfer files.
The provided software is for Windows operating systems only.
Once you have transferred a movie to your PC, it cannot be copied from your camera again.
The camera cannot be turned off while plugged into the computer.
Read more: How to Transfer a Panasonic SDR-H40 to a Computer | eHow.com http://www.ehow.com/...l#ixzz1Lgw1wP9E
Should you need it your user manual is available @ http://service.us.pa...SDRH40P-MUL.PDF