Software could not be verfied

I have just downloaded Lion from the apple store having previously paid and installed it on  another macbook.  However, when I try to install I get a message telling me that the software can not be verified because it has been corrupted or tampered with during download.  I have downloaded the software again and recieved the same message when installing.  Is this a common problem?  Is there a fix or do I have to keep downloading until it finally works?

Scroll down to "How to Make a Lion Install Disc " on this page:
The Essential Guide to OS X Lion | Mac|Life
Follow the instructions to create an installation disc or USB flash drive. Use that to complete the installation.

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