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shellext.dll - Explorer is LAME and Chrashes many Times and Restart

i dont know what happen .. my Explorer is very LAME and Crashes many Times per day.
If i klick Right on Voluime (any) the Explorer Restart after 2 Minutes bevor it hang on and nothing gonna do..
Hope you can Help

The details of the shell extension that might cause the problem:

Shell Extension Name:  
Filename: shellext.dll
Description: Microsoft Security Client-Shellerweiterung
Company: Microsoft Corporation
Product Name:
File Version: 4.9.10586.0 (th2_release.151029-1700)
CLSID: {09A47860-11B0-4DA5-AFA5-26D86198A780}

If you think that you have similar problem in your system, you can try to fix the problem by disabling the specified shell extension. In order to do that, simply follow the instructions below:

  1. Download and run the ShellExView utility from this Web page.
  2. Find the right shell extension according the details specified above.
  3. Select this shell extension and press F7 to disable this extension. After disabling the shell extension, check if the problem still occurs. If the problem still occurs, you should enable back the shell extension by pressing F8, and then try to search for another shell extension that might cause your problem.