Not opening attached PDF files anymore

I just moved my zotero 2.0 libary from a OS 10 Mac to a PC (Windows 7, Word 2003) and thought everything worked out fine. But suddenly a problem appeared: Zotero doesn't open my pdf files anymore directly from the entry in the library. This applies only for pdf, because it opens attached word-files! Plus, strangely enough, when I click directly on the PDF in the storage of zotero, it is also possible to open the pdf's (I have Adobe installed).
What is this for a strange problem and who can help me?
Thank you
nina
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