If you look at the top right of your camera screen when reviewing pictures you should see the frame count. As yours is reading "Frame number full" the count should be reading 999.9999 so you need to reset to 100.0000. How to do this is posted in my tips section of my profile under "THE ONLY WAY I KNOW HOW" I have pasted the section below.
FRAME NUMBER FULL!!
If you get this message on screen then your counter has reached 999-9999 and the camera will not take anymore pictures until you reset the counter to 100-0001.
To do this follow the instructions in your manual or read on my friends...
Firstly, make sure you have a picture card
inserted into your camera and you have saved any pictures on it to your pc because you are about to format the card inside the camera and you will lose any pictures you have stored on there.
Ok. turn your camera on and press the menu/ok button and select "SETTINGS" from the menu.
Scroll through the menus until you find FORMAT. Select this and you will be asked if you would like to continue. Select OK.
Depending on how large your card is (16mb - 1,2 gb etc) will determine how long this will take but it's not very long.
After you have done this your card is now wiped clean of memory and has been formatted to be used for your cameras software.
Next, select FRAME in the SETTINGS menu and set your camera to RENEW and press OK.
Now come out of your menus and take a picture.
Review the picture taken and check the counter reading in the top right of the screen. It should now read 100-0001. The counter has now been reset.
Now go back into your menu and select SETTINGS again and scroll down to FRAME once again. Set this back to CONT (continuous) and press ok. Your camera should be reset and you can now use it.
Note: If you have more than one card you will have to reformat each card because the camera will store and recognise the frame numbers stored on the card and continue using them rather than set them to 100-0001 or will open a new folder on your card and start using this as the new one thus taking up more space on your card reducing the number of shots you can store on it