I recently purchased a new computer and in the process of transferring all my FSX files over from my old computer.  The one new thing that has started is when I load up FSX,  I get the following pop up message..."eSellerate ERROR - 25007 Machine Mismatch, and your activation will be verified now."   I tried to Google this but nothing shows up to explain this message.  It has not effected FSX, so far, but I am puzzled what it means.

One of your add-ons was purchased using eSellrate. This is one reason for doing a reinstall and not a file copy.