As DarrenP already pointed out, only 1 Inventor product can be installed. So, it will be either Inventor 2014 or Inventor Professional 2014 depending on the edtions of Suites you have.
Product Design Suite Standard 2014 includes Inventor 2014
Factory Design Suite Ultimate 2014 includes Inventor Professional 2014
If you have both of the above, then you can choose to install either edition of Inventor 2014.
I've marked DarrenP's post as a solution of this post.