Arctoolboxs suddenly unresponsive

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My Arcgis Desktop 10.1 was working fine until, suddenly, I became unable to use the Arctoolbox tools :

• when I try to open them from the arctoolbox window they just do not answer,
• when I try to open them from the search tool I get a warning/error message :

"

Warning

Adding this item is not supported or the application that opens it is not found.

OK

"

I've done researches on internet, but although some problems deal with arctoolbox dysfunctionalities, I found none that are quite like mine.

Anybody has a suggestion or solution ?

Thanks.



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