i have captured los of pictures from my digital sony camera dsc-w620 but when i connect with computer to transfer the pictures it shows no images i dont understand what to do
You probably have to turn on USB mode on the camera to have it synch properly. Once you plug the camera in, turn it on and look in the settings, there should be an option for USB connect mode, or something similar.
How old is your memory card? Also, many cameras have internal memory as well as the option for a SD/XD card. When you plug the camera in, look to see if other folders pop up, you might just be looking in the wrong place.