Can't install 10.8 on my mac

Hi all,
i tried a lot but i always get the same error. When i try to install 10.8 on my Mac Book Pro 17" Early 2008 (running 10.7.5) it says that the image i loaded from the App Store is corrupt and i do have to load it again. But that doesn't work. I tried loading it on different machines, installation via USB... everything. Everytime the same error. Does someone know this problem and is there a way to work arround?
Btw: My local dealer couldn't help...
Thanks in advance!
schnittchen

Make sure you meet ALL the System requirements for ML.
My local dealer couldn't help...
Why not?

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