Dang mystery > session Drummer 2

Howdy
OK, so i've been playing around with SD2 for a couple of months now and sort of getting the hang of it. But i've been having all sorts of trouble lately with between my m-audio and blue screens on the laptop. So i did a back and reimaged the laptop and did a clean install of Sonar  (using X2 Studio by the way).  and guess what.  no sign of my Session Drummer 2.  Reinstalled Sonar again...same.  When i open any of my projects i get an error saying Session Drummer not found.  Now i dont actually remember ever buying SD2 separately and when i go to my account history i can see all the products i ever purchased and there is no SD2.  I always assumed it was part of X2.  So how in tarnation did I have it to begin with and how do i get it back.  Any SD2 users out there ever seen this?    Thanks in advance guys. 

Hi James.  thanks for the reply.   No i started out on music creator 6 and upgraded to SonarX2.
I've never had any other versions of Sonar.  I see SD2 can be downloaded for €40 thereabouts.
That would be about be about $50 US (ballpark).  So not an expensive item if i have to buy it.  But its a dang mystery how i had it to begin with.   I've mailed Cakewalk help to see if they view my account and see if i perhaps bought something and SD was thrown in as a bundle etc.

Hey great tip Paulo.  i'll check out that link.