p.s. Computer running Win7
Acrobat X v 10.1.3
Normally, the "In this file" option is only grayed out if there is security set. Do you see the words (SECURED) at the very top of the Acrobat title bar or a lock icon in the Navigation pane? Are you opening this document from a network location? If so, try saving a local copy and then running the OCR.