I registered for a new license in March this year but I always have an error message at the start of play saying license number not entered. Until now, I have just clicked it away but before it drives me round the bend, will someone please tell me how to get rid of it. I just know it is simple.
Welcome to the forum. 
What’s the error message ???
Which avast! are you using ??? Free, Pro or, IS
What version # ???