The slide show will not show all the pictures on my memory card.

If you have a memory card (e.g. SD card) that happens to be a "fake" (or counterfeit), it may give you this error. Often, such a card has less storage space than what it claims to have, e.g. it is labelled as an 8GB card, but it is really a 2 GB card, or have much less than 8 GB.
Such a ("fake") card may have (internal) data that says it has (say) 8GB ... when you insert it into your PC. But if you test it, e.g. using H2testw (a free utility that you can download and run ... i.e. no need to install on your computer), it will show you the real size of the storage capacity.
So, if your (fake) SD card happens to be full, your camera would be trying to store more pictures on it, and it would not be successful, or (sometimes, even worst), it will say it is stored, but it really is lost.

What make and model camera?

Try downloading all your pictures from the card to your computer and then reformatting the card. Alternatively, try another card. What happens then?

The number of photos you can shoot depends upon the size of the memory card, you must have a small memory card in your camera . Try inserting a 4Gb to 8Gb memory card in your camera.

Download all your pictures from the card to a computer and then format the card in the camera.

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 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 any photo cataloging program.

The memory card may have to be formatted for the phone with the phones format procedure via the PC and the proper software.

It's possible the camera won't take an sdhc card. Or maybe you just need to move the slide switch on the side of the card to unlocked or that you need to format the card in the camera.

If its cost a lot, it should have warranty. Go and ask for a replace. 7.63 GB is ok for a 8 GB card. cz, file system itself takes some space.

But i dont think the card is still good.

u not hv the problem in ur memory card.
when u download anything then ur mob shows his own memory not the memory of card....
and which is very low.
so u can go to ur mobile settings and change ur shown memory.
if u can do it, then u will b download anything on ur cards memory..
thnxxxxxxxx
n TAKE CARE

The newer large capacity cards in cameras designed for smaller capacity cards seem to have trouble interfacing with our computers. The best best is to get a high speed firewire memory card reader and attach it directly to your computer.
This should allow your computer to recognize your card and also allow you quicker downloads.