John,
Two things:
1. Acrobat X isn't supported with the current version of Search, and will not work properly. Search supports up to Acrobat 9.
2. You need to run Acrobat as Administrator in order to be able to activate Search properly. You should right-click on the Acrobat executable, and choose "Run as Administrator".
Regards,
Raphaël Lalonde Lefebvre