Did you rerun the WKupdate. I'm pretty sure you would have done that...
I ran into a PDF issue recently (not quite the same) and only needed to register the dll. However, the instructions said to check that the dll is cdintf300.dll (not cdintf.dll) in the windows\system32 folder on the PC. Also, based on the computer being a 32 or 64 bit machine, the size of the cdintf300.dll should be 3,436kb or 3,744kb, respectively. If you want to look at the full KB article that helped me, it is called ""Error: External Exception C015000F when printing to PDF Using Paperless Office"" Not sure it will help, but since you're stuck, might want to take a look at it.