I have given up finding a solution to the problem. I no longer use Adobe Acrobat Professional full as I have tried both updates 8.0.1 & 8.0.2 to no avail, and is now unsupported as Adobe is up to version 9 of this software. I have opted for a freeware solution, so I have uninstalled Adobe Acrobat Professional and installed the freeware CUTEPDF Writer at
www.cutepdf.com. It works beautifully on Vista X64 on all documents, including Microsoft Word and Scanned Images and Photos. I'm very happy with the results.