Unable to install Lion, error message says unable to verify software

i have downloaded OS X Lion twice from the App Store. After running the installation process, 1 sec to go, an error message pops up that says:
"Error. The software could not be verified. It may have been corrupted or tampered with during downloading."
any idea of what may be causing this and how to fix it?
thanks

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Message was edited by: kostby
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Unable to install Lion, error message says unable to verify software

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