When Im making a map in the creative kit. Windows will force me to close the program. It makes it hard to get any work done. Then when I can get things done ill try and use it in game and parts of the land will be missing. the rocks and caves i put down will dissapear. Am I doing something wrong or what?

You are probably doing something wrong ... but you are on a very steep learning curve, wanting to do probably the hardest thing you can and also the least documented thing there is.

There is a New Worldspace Tutorial in the Sticky Thread at the top of the board ... have you checked that out?