You have a Windows Explorer shell extension that is developed by the Microsoft Foundation Class library (MFC). The shell extension is hosted in Windows Explorer. However, the Explorer.exe process stops responding (hangs) when you open Windows Explorer.
This problem occurs because of a code defect in MFC.
A security update fixes this issue. To download the update, visit the following Microsoft Web site:
Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package ATL Security Update
For more information about this update, visit the following Microsoft Web site:
Description of the security update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package: July 28, 2009
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
This problem exists in the following MFC modules whose versions are in the range between 9.0.30304.0 and 9.0.30729.176.