Renew license problem

Hello Doreen,
I'm sorry to hear that you're experiencing issue with AVG activation. Please send us a screenshot of the error message to assist you better. You can check the following link to see the instructions about taking the screenshot (http://support.avg.com/SupportArticleView?urlname=How-to-create-a-screenshot).
Best regards,
Alok.

I have just paid for new license, got a new number to put in but it says it is not the right one

Hello Doreen,
I'm sorry to hear that you're experiencing issue with AVG activation. Please send us a screenshot of the error message to assist you better. You can check the following link to see the instructions about taking the screenshot (http://support.avg.com/SupportArticleView?urlname=How-to-create-a-screenshot).
Best regards,
Alok.

Doreen, 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