Internet Explorer crashes when using the Reader or Acrobat plug-in

Sometimes Internet Explorer (32-bit) will crash when using the Reader or Acrobat plug-in to display a PDF in a browser window.

The reason is that some third-party PDF creators use Acrobat’s DLLs, but rather than keep them in their own folders, copy them to system32/ which causes Acrobat to open defunct DLLs – and fall over as a consequence.

To resolve the issue, do the following:

Open C:\Windows\system32

Move the following files somewhere else (for example, create a folder C:\bad_dlls):

ace.dll
AGM.dll
BIB.dll
BIBUtils.dll
JP2KLib.dll
cooltyp.dll

Of course, this means that whatever application installed those DLLs in system32 will stop working.
Identify it, and contact the software’s publisher to check if they have a solution.

If you’re feeling adventurous: You could tentatively open the Acrobat/Reader folder under Program Files\Adobe\Acrobat\Acrobat 9.0\ , and COPY the corresponding DLLs to system32 – but that is of the “dirty hack” class and would be generally disadvisable. The third party PDF application would not necessarily be able to use these DLLs anyway.