Mountain Lion downloads but error on install

I have downloaded Mtn Lion successfully but get this error when trying to install 'this copy of the install can't be verified. It may have been corrupted or tampered with during download. delete this copy and download a new one'
I have done that and am now on my third download. Does anyone have any suggestions?
I have a MacBook Pro running 10.7.4

Just in case something is wrong with your HD, use Disk Utility and verify.
Other than that, there's no choice, you have to download again.

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