CS6 suite - cannot open acrobat to activate it.

I have the CS5.5 suite and the CS6 Suite.

I upgraded from CS5.5 learning edition to CS6 Pro.

Now I am trying to print things to a pdf but although everything else is registered - Acrobat keeps saying it is not activated.

I went into the AAcrobat folder and tried to run the Acrobat.exe but it just does not open.

How can I open it to activate if it will not open..

Thanks in advance

Terry