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I am using Windows 7 - 64 Bit on a Dell XPS Laptop.


I have just had this problem reoccur after spending 2 hours trying to solve it a couple of weeks back.  The last time I ended up deleting the PDFCore8_x64.dll which only seemed to effect the plug-in PDF viewer in Outlook and the behaviour when a link to a PDF document was clicked from within an email.  I have no idea how the problem has come back into existence as I don't recall doing any update on PDF Converter. 


I think the file is located in:  C:\Program Files (x86)\Nuance\PDF Professional 8\bin


Am just deleting it now and notice the date of creation of that file is 9/12/2011.  I think there has been an update to PDF Converter 8 since.  However, it caused further problems for me viewing PDFs so I had been going along quite happily until recently with the original installation of PDF Converter 8.


I assume the problems have occurred due to a Windows 7 update in recent months which has somehow changed how the particular .dll is loaded.


Would be interested to receive a link to any Nuance Patch for this problem.


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