If you continue to have problems displaying pdf and doc files, perhaps a different approach might help you.
Let me say at the outset that I have no experience with Vista, and I hope to keep it that way for a long time.
A brief background to explain why.
PDF has become an almost universal format for document exchange, but unfortunately, a few years back Adobe started
fine-tuning Reader. This caused some compatibility issues with different versions of PDF files and the versions of Reader used by clients from all over. I decided to try for something different.
PDF Files
I found a great utility called PDF2EXE:
http://www.pdf2exe.com/pdf2exe.html. There is a freeware version. This takes all the PDF formats I've tried (not any versions post-early-2007) and they have worked perfectly. You can then use this with the standard
Launch Application.
DOC Files
It suites my purposes to save all these DOC files as RTF and import them into an Opus chapter that I've sized to allow the RTF files to display on top of the page from which it is called.
Perhaps these ideas might help you find a way around your current challenges?
Sometimes, when all else fails, we need to look outside the square.