HT201364 I've downloaded Mavericks, but cannot set up the installation.

I've downloaded Mavericks, but cannot set up the installation.  The clock just keeps turning, and I can't continue or exit.  Any idea of what to do next? I believe my system meets the requirements, although I'm not real sure of the age (I think I purchased mid 2007 or early 2008).
Model Name:          iMac
  Model Identifier:          iMac7,1
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2.4 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          4 MB
  Memory:          4 GB
  Bus Speed:          800 MHz
  Boot ROM Version:          IM71.007A.B03
  SMC Version (system):          1.21f4
I appreciate anyone's help.

Mid 2007 or later should be ok >   OS X Mavericks: System Requirements
How long has the installation taken so far? On a high speed broadband connection, it should take about 45 mins to an hour.

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