While upgrading from OS 10.4.1.1 to Leopard, I get a message that I can't upgrade because my computer is not running OS 10.4 which I clearly am.  What's the problem?

I purchased a Mac OS X Leopard on Amazon to upgrade my 2006 Apple iMac.  After inserting the CPU Drop-in DVD, and clicking the Leopard OS 10.5 installation icon, I get a message that the upgrade cannot happen because the upgrade installer cannot find OS 10.4 or later on my computer.  My system profiler indicates that my iMac is running OS 10.4.1.1.  What is the problem?

I came upon the solution in another discussion thread.  The solution is to simply wait 8 to 10 minutes on the language selection dialog box allow the install program time to find my OS 10.4.1.1..  I then clicked on "Continue" and the install proceeded without any problems.  I know am running Leopard OS 10.5.8., So far with no cliches..."knock on wood".  Thanks to all who responded to my original question.

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