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So apparently something from Adobe Acrobat is loaded and unloaded every time such a popup appears, at least on my system!
This is what I call a WAD - Working As Designed.
PDFshell gets installed when you install Acrobat or Acrobat Reader to enable functionality within Windows Explorer / the Windows Shell. This is fully and completely normal, and nothing to panic over and/or complicate code unecessarily over.
A referenced hotfix for Windows XP SP2 systems is here:
http://support.microsoft.com/default.as ... -us;909486
I doubt anything within your code can address the issue, as it's a crash happening in Windows code, thus the reason for the hotfix above. If it's not corrected by the hotfix (or newer versions of the files listed in the hotfix, like from SP3), then the person having the issue should probably check for updates to any and all shell extensions they have installed and/or contact Microsoft.
Also, you are aware that Acrobat Reader is up to version 10.1.1 now? 7 is very old (released in 2005)... Version 10 (Reader X) added sandboxing for Windows versions...