Tank you for your answer. No, I never saw any error message and I already found a solution: I clean reinstalled AVG and for now I'm again a happy customer 
I've been using AVG free edition for years with no problems. Now, suddenly, when I scan the computer it crashes after five minutes. Anyone experienced the same problem and found a solution? Thanks a lot.
Hello Fosji. Have you received any error message while scanning?
Hello Fosji. Have you received any error message while scanning?
Tank you for your answer. No, I never saw any error message and I already found a solution: I clean reinstalled AVG and for now I'm again a happy customer