Stupid Computer?

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ok…………I was trying to download a game that has an dmg file. ok……… it downloads but I can't open it. Everytime I try it says 'disk can not confirm'. What the HELL DOES THAT MEAN. YES I HAVE A MAC AND I'M SICK OF IT………ok I'm calm now, anyway……this has never happen to me before. Can you please tell me what is wrong with my laptop? and what should I do. I think I deleted something………gosh I don't know. I have a headach just thinking about it all over again. ***PLEASE HELP ME***