Never heard of "PDF-XChange Viewer" (for Windows I would recommend Adobe Reader or Foxit Reader), but for OCR-ing purposes you really should use something else. Try ABBYY FineReader.
https://www.mobileread.com/forums/sho...php?t=154638#2
https://www.mobileread.com/forums/sho...d.php?t=149448
Formatting (as in italics, bolds, etc) will be preserved, but the layout and TOC you'll probably have to do yourself.