I took alot of pictures recently..seemed to be working fine and they didn't download to my memory card...are they in my D5o Nikon somewhere..

bad memory card happens alot buy a new one!

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ALTERNATE WAY TO TRANSFER PHOTOS TO COMPUTER
If your photos are stored on the memory card, then remove the memory card from the camera and insert it into an USB memory card reader. Connect this USB memory card reader and memory card into the USB port of your working computer. Your computer will see this as an USB Mass Storage Device or an external storage device; you can then open the folder on the memory card and copy the photos to your computer. Memory card reader is a handy device and is inexpensive. You can copy photos from other cameras and you can also download photos off your memory card to someone else's computer without the need of installing any programs.

No. Without a memory card the camera stores the last picture taken only so you can view it to verify proper operation. It overwrites the previous picture, and it disappears when you turn the camera off.

You NEED a memory card if you want to save the pictures. Sorry if that wasn't the answer you wanted to see, but that's the way the camera works.

ALTERNATE WAY TO TRANSFER PHOTOS TO COMPUTER
If your photos are stored on the memory card, then removethe memory card from the camera and insert it into an USB memory card reader.Connect this USB memory card reader and memory card into the USB port of yourworking computer. Your computer will see this as an USB Mass Storage Device oran external storage device; you can then open the folder on the memory card andcopy the photos to your computer.Memory card reader is a handy device and is inexpensive. Youcan copy photos from other cameras and you can also download photos off yourmemory card to someone else's computer without the need of installing anyprograms.

how do i preview the movie on the nikon coolpix 8700? and how canu able to takemoviefor long time,while to me its take about 30sec only?

To delete individual pictures, press the trashcan button while viewing the picture, then confirm.
To delete all pictures, format the memory card. FixYa is full of people asking how to retrieve pictures from cards that hadn't been formatted recently.
The format command is in the setup menu. Full details are in the "Formatting Memory Cards" section of the manual (page 24 in my copy). If you need a manual, you can download one here.

Remove the lens cap.
Yeah, I know, I know. But you'd be surprised.

You can download a PDF manual from
http://support.nikonusa.com/app/answers/detail/a_id/16310/kw/L19/r_id/116678

You can order a printed manual from
http://shop.nikonusa.com/store/nikonusa/en_US/pd/productID.215420400

You can download the current versions of all (free) Nikon software from
http://support.nikontech.com/app/answers/detail/a_id/61

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 or FireWire). 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 Nikon Transfer or any other photo cataloging program.

As per the Samsung digimax range, internal memory seems to be faulty. Insert an external memory card and try to power up the camera.....