Kingston 4g not recognized in my camera and computer. It happens only after taking some pictures for few hours and turn off the camera. And when I open it media was not recognized and all my photo was not accessible in my camera.try it in my computer using card reader, soma thing. No drive is recognized.

Did you try to change the date? either on the camera or on the computer... it might be that otherwise data won't get recognized if the date range is too far out. If you really deleted it from the card, I am afraid it's really gone. If you look at the card via "My computer" and do a detailed file list with details and dates, you might still find the missing data. Good luck.

Try NOT connecting your camera to your computer.
The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.
Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo management program such as Picasa ( http://picasa.google.com ).

if you have a multi card reader there should be no proble or try using the usb cable for your samsung camera

make sure your camera is off when you hook the usb cable from your camera to your computer, then after doing so turn you camera on, wait a few moments, if nothing happens go to you destop to my computer and click on the removable hardware, it should work
also what program are you using and what operating system do you have?

Check if your camera can support a 4G card. Some don't support than 2GB. if it supports, re-insert the card.
PS. If you have a card reader. Formatting once from your computer can help.

Was the camera turned off, it must be turned on and set to USB to PC in settings menu.

cant transfer pictures 2 computer

check the connecting cable or try another cable 

Mine does the same thing, and i have done everything to try and maake it work, but it doesnt, and it is geting me so fustrated all the time.

The computer recognizes the camera as removable drive. Check "My Computer" for a drive that you haven't seen before. this will be your camera, and the files should be accessable. Failing that, your computer may not recognize the camera at all. The problem then, is in the computer's software.