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):


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.