Trouble taking pictures, help!

[wateryworld]

I just purchased a new camera, since my old one was only a 3.2mp, very grainy and bad with colour correcting.  I'm frustrated with the fact that this one seems not much better.  The picture shown on the LCD display is NOT what you actually get, displayed once transferred to the computer.  I had to go into photoshop and seriously edit the colours to get it to come as close as I could to the LCD colouration.  Why is this?  Is the camera lying and hoping the users are too stupid to notice, or is my monitor seriously messed up for some unknown reason?  How can I, if possible, correct this unfortunate problem without having to resort to photoshop every time? 

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