Also, if the issue still persists it may help to obtain a user mode dump for the crash to see if a particular third party module may actually be causing the crash.
You can configure Windows to create user-mode dumps. Create a System Restore Point first.
If you copy and paste the following in Notepad and save as a .reg file (save with the .reg extension and give it any name such as explorerdump.reg) then right-click the .reg file and select "Merge" to add to the registry, a .dmp file at the time explorer.exe crashes should be created in the C:\CrashDumps folder:
Windows Registry Editor Version 5.00[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Windows Error Reporting\LocalDumps\explorer.exe]"DumpFolder"=hex(2):43,00,3a,00,5c,00,43,00,72,00,61,00,73,00,68,00,44,00,75,\00,6d,00,70,00,73,00,00,00
After Explorer (explorer.exe) crashes, can you then make the .dmp file available (provide link) via a public folder on Windows Live SkyDrive or similar site.
Here's a couple of links on using OneDrive (SkyDrive):
http://windows.microsoft.com/en-ca/skydrive/add-photos-files-faq
http://windows.microsoft.com/en-ca/onedrive/share-file-folder
More info on collecting user-mode dumps:
http://msdn.microsoft.com/en-us/library/bb787181(VS.85).aspx