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Which operating system are you using, and which version? Have you tried to re-install Acrobat to see if that fixes the problem?
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Windows 7 Home Premium 64-bit. Yes, I reinstalled Acrobat Pro XI and made sure it is up to date. I can print pdfs directly from Office applications BUT not from Windows Live mail or IE. From Word, Excel and so on one just clicks the button and the PDF converter fires up and creates the document. From WL or IE one has to select a printer, which also shows as the PDF Converter, but nothing happens.
I have to admit that I'm much less pleased with XI than with X. I was trying to create a Portfolio today (which I often did in X) and had all manner of issues with Flash Player needing to be installed etc. etc. That's off topic I know, but this printer problem has never occurred with previous versions of Pro so I'm suspicious Adobe has added some bugs.