I have a Casio Exilim S12 digital camera, and after I take a picture it says "busy, please wait" is there a way to get rid of that or fix it? It makes picture taking very slow.

Assuming it finally goes off. The camera is busy saving the image to memory. You may try faster memory cards to shorten the wait time. You may also need to save all your images to your computer then re-format the card in the camera.

Lenses that are stuck when closed are almost impossible to fix. Sorry.

Take a look at this tip.

Try using a different memory card.

Use a card reader to download to a folder you create on your desktop.

Try these procedures.

I was having the same problem and contacted Casio. The issue seems to be that there are pictures/video on your internal camera memory which is conflicting with the memory card. Here is the fix:
Turn of the camera and take out your memory card Turn on the camera, click menu, setup, hit the up circle twice and click reset and click reset again until the camera resets
Then click menu again, setup, hit the up circle twice and click format, click format again until the camera formats
(This will delete the pictures from your memory card so make sure you have them saved) Turn off the camera and put your memory card back in, turn the camera on again. Repeat the format process for your memory card and you will be good to go!

On play mode, press MENU, on PLAY tab-->COPY-->BUILD-IN->CARD, press SET,then wait until the "Busy...Please wait.. disappears.

If the photo shoot out show white , the obscure (quality variation), and even horizontal line ( white lines), and so on over-exposure cases, even if the use of anti-tremor, set to default values are invalid, because the camera shutter fault.

Can't repair by yourself.
It's need repair camera machine shutter.

more detail CASIO Exilim EX-Z700 overexposure

You don't. That is something that Casio will have to fix. Call 18007062534 and choose option 2. Tell them you have a stabilizer error and they will tell you how to go about sending it in.