Ubuntu wont load installation.

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http://www.ubuntux.org – Okay I put in the cd, the first time it loaded installation but took forever to do anything. Finally (when i got back from school) It was loaded and it went to the desktop I saw to icons, Examples and Install. I clicked install and it gave me an error (Not immediately it took 5 minutes to give me the error). Now when i put the cd back in it automatically loads up the desktop and doesnt give me installation options... BUT Now when its acting like its loading up the desktop for the first time to install it just goes to a black screen, Haven't waited another 6 hours for that too load up yet but i (Distributions)