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Dancepal1948 Level 1 (0 points)

I downloaded OS X Lion this morning and when I went to install it I got a "Screen - Select the disk where you want to install OS X."  -- Had two disk my Macintosh HD and my Time Machine (both are 1TB).  The top and most important is the Macintosh HD (999.86GB - 739.75GB available states "This disk cannot be used to start up your computer".  What do I need to do to install OS X Lion?

20" intel-based iMac, Mac OS X (10.5.7)
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