When i take pics the zoom lens doesn't come out

Does it work OK with another lens? If so, problem is in lens. If not, then problem is in body. I would suspect the lens

Try removing the battery and memory card for at least 15 minutes. With some cameras, this will reset the camera and lens may clear the error message, as long as there is something that is not physically damaged the camera.

The zoom button merely zooms in on the display. It magnifies a portion of the picture so you can get a better look at what you're about to photograph. LiveView or otherwise, if you want to zoom, you have use the zoom ring on your lens (assuming you're using a zoom lens in the first place, of course).

If you have some skills, you can open the camera and cline your zoom lens with toothbrush and compressed air. Try to separate zoom lens from the electric motor. usually is 2 or 3 screws. You will see a lot of sand inside the camera and lens. And next time when you will go to the beach, you will take more care about your camera.
Solution 2, and more easy is to buy another zoom lens from ebay.Or another camera same model with broken LCD or other technical problem than zoom lens.

i want to delete pics from the memory disc in on my camera it's a olympus digital camera c-920 zoom

Cha -- Ching!

zoom will not work in movei mode.
operate zoom before shooting in movei mode.

What you are experiencing is not blur, its camera shake. You are shooting in low light so the shutter speed is being reduced by the camera's automatic features. Also the longer the lens (the farther you zoom), the higher the shutter speed you need. Even for non moving objects or when panning the shutter speed should be at least one stop above the focal length. ie - 300mm lens = 500 or 1000 shutter AT LEAST! (and don't forget, if its a film lens on your rebel, thats actually 300mm x 1.6 =480mm, so 1000 shutter or higher min.) Moving objects require even faster shutters. Solutions: Get faster (also called brighter) lenses which can be pricey. In low light use higher iso settings in the camera menu. Shoot in either manual or Tv mode and choose the higher shutter speeds while using the light meter to decide aperture. Use wider angle lenses or back off the zoom and move closer. Stabilizers built into the lens can steady the shot by two to four times as well.

It sounds like your lens's focus element is stuck. Given the events you describe it is possible that a grain of sand has worked its way into the focus motor's gearing and jammed it up. Normally the small motor moves the focus optic in and out to achieve proper focus, if its movement is limited or completely jammed you will experience blurry pictures. The camera will have to be disassembled and the sand cleaned out to restore normal function. There are repair providers you can find online who can work on your camera. David Millier Advance Camera Repair

well u can, but u will need to know what are u doing, i repaired many lens when i worked in olympus, but gives lots of work.