In our Case it is only one install of Acrobat 9.1 , no updates, fresh install ...
In OCS Software-List there are 2 entry with exact the same Name "Acrobat 9.1"
Cleanings the registry brings no other results. there ale still 2 entrys for Acrobat in the registry. one in "....local-Maschine" and one in "...User"
Acrobat 9.1 in this case is just a example, we have more Software with duplicate entry in ocs ...