PDF Fusion Version 1.0: Getting error message "this page did not load correctly"

Equipment / Software:   HP Pavilion Laptop dv6-3230  Corel Office X6, Corel PDF Fusion Version 1.0;  HP Photosmart 7520 Printer.     Sometimes, I scan a WordPerfect document that I have printed & signed it using my HP printer scanner software and save as a pdf document to file.  However, when I try to open the .pdf document with Corel PDF Fusion, sometimes I get the error message "this page did not load correctly".  Why am I getting this?  Sometimes I get this message; other times, I do not.  HELP!  How do I solve this problem?   Any help greatly appreciated!   sahintx