How is this "Clean new instalation?

Like in my previous post ,Im about to get Acceleration this evening ,I see many issues among Users of acceleration Sp2 posted in this forum, as a result ,some of the experts here recomends a clean New instalation.what do they mean?
Is this mean an Activation ? to waste my 3rd and last chance?
Does acceleration comes like the old SP1 ,to Activate again?
would anybuddy please explain me ,If I get it , would I have to unistall FSX and then reinstall it without applying SP1? would it request me again an activation?
Thanks
Is this mean an Activation ? to waste my 3rd and last chance?
Does acceleration comes like the old SP1 ,to Activate again?
would anybuddy please explain me ,If I get it , would I have to unistall FSX and then reinstall it without applying SP1? would it request me again an activation?
Thanks