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The reason for this error message is that the root of the C: partition is compressed. Once you uncompress it (just the root folder, the rest may remain compressed), the encryption process should start to kick off.
By the way, if you enter the error code into the McAfee knowledge base (located at http://mysupport.mcafee.com/Eservice/templatepage.aspx?sURL=3), you'll receive sometimes a useful article (most of the times only an error code listing with the text of the error message only and no explanation).
This one belongs to those, where you'd also have found the solution.