Try opening Acrobat after you open one of the other packages in CS. I do not have CS, but there are some peculiarities with it that seem to be like you are experiencing. If you are not successful in starting Acrobat, you might go to the contorl panel and run Add/Remove programs or Progams... to do a repair.
What version of Acrobat is installed on your machine? What OS are you working upon?
Has this issue started occurring recently or since some time?
You should try the method suggested by Bill@VT and see if you can resolve this issue easily.