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Adobe Acrobat Doesn't Open

If Adobe Acrobat open doesn't open, or if PDF files do not open when clicked, this may be due to a damaged registration file.

This has been observed with Acrobat X but may also apply to other versions.

To resolve, open an elevated command prompt and type (if using 64-bit Windows):

ren "C:\Program Files (x86)\Common Files\Adobe\Adobe PCD\cache\cache.db" cache.was

If using 32-bit Windows, type:

ren "C:\Program Files\Common Files\Adobe\Adobe PCD\cache\cache.db" cache.was

Upon opening Acrobat, it may prompt to log in to your Adobe account or re-enter the product key.

This is also known to occur 30 days after installing Acrobat X as part of a CS suite. In this situation, deactivate the entire suite using a product other than Acrobat (HelpDeactivate), then re-activate using a product other than Acrobat.

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