Nikon Coolpix S3100 - Why can't I save my photos after editing?

I can upload and save my photos but I can not overwrite the original photo file once I have edited it (crop etc). I had to save as a gif file, then open that gif file and save as jpg. I took a random photo twice with two different cameras, one per memory cards, thinking it was the card. It turns out it was the photos taken from my Nikon compact camera that would not let me save the edited photos.

Is there something wrong with my camera or is it just made that way where the photos are copyrighted in some way?

It was bought last year and don't have a receipt so can not take it back to the shop I bought it from
Added (1). The editing software I use is absolutely fine. I have two compact cameras and two memory cards. The two photos I took using my nikon (one with each memory card) would not let me save the photo after I had edited it on the PC. I had to save it under a different file type, re-open that file and save as a jpg (overwriting the original jpg photo uploaded from the camera).

I took the same two photos using my other camera (again, one with each memory card). Once uploaded onto the PC and had opened it for editing, I was able to save both photos and overwrite the original file). I bought the nikon as this camera screen is cracked, but have kept this camera in case the battery dies in my nikon so I can keep taking photos (as it uses normal AA batteries)

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My Nikon Coolpix L22 won't turn on?

I got a Nikon Coolpix L22 for Christmas and it's worked fine so far. The other night I was trying to upload some pictures to my laptop, but my laptop was failing to install the software (I've never successfully downloading pictures to my laptop) so I figured I'd just upload the pictures onto the home computer in the morning. The next day I tried to turn the camera on and it won't turn on. I've changed the batteries 3 times. I tried a pair of Rayovac, a pair of Alkaline, and a pair of Duracell. My camera has accepted all of these batteries fine before. The Rayovacs were brand new out of the package. I made sure I had them all in right. I looked it up and everything just keeps telling me to replace the batteries. I really need my pictures now. I'm at my wits end. Does anyone know what might be wrong with my camera?

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