While you are preparing the info for Rich can I also ask: the A0C error means the computer name and what's in the license file don't match., so have you changed your computer name ? Or copied license files between different computers ? Or perhaps your computer-name [or even user-name?] contain non-standard characters [like accented letters or other non-standard characters] - the Microsoft requirement is for computer names to have only ASCII alphanumeric characters [A-Za-Z0-9] and a few common punctuation characters, and not following this can result in weird issues when comparing licenses and computers etc - I am guessing you are perhaps french so accents could be the issue...