Program dropping lisence need number I don't know where it is

Hello Lyne,
We apologize for the inconvenience.
To assist you better, could you please send us the screenshot of the error message you receive and also let us know if you are using free or paid version of AVG? Click on this link for the steps to take screenshot http://avgclick.me/getscreenshot
Thank you

Several months ago I started getting a notice that the number wasn't right.  I hadn't used the computer for some time as it wasn't protected I stopped using the computer I want it fixed

Hello Lyne,
We apologize for the inconvenience.
To assist you better, could you please send us the screenshot of the error message you receive and also let us know if you are using free or paid version of AVG? Click on this link for the steps to take screenshot http://avgclick.me/getscreenshot
Thank you

Lyne, For your info, just in case that you are unaware, you can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions. 
AVG Guru