That's the same error message I saw (in English) when reinstalling java recently, but moving all java receipts to the desktop allowed the reinstall, so I'm not sure what's going on . . .

perhaps a shutdown for 2 minutes and then a restart will help. I'm assuming you're downloading this java update:
http://www.apple.com/support/downloa...update142.html

oops--that update doesn't mention French (I don't know if it matters).

Perhaps Software Update will work.