Stopping unwanted sales offers from AVG

Hi, can anyone tell me how to stop the constant AVG Automatic maintenance dialogue boxes that keep appearing on my screen. When I try and close them I get a second box telling me my PC is not optimised and asking me to buy the full version of AVG PC Tuneup. They drive me mad and I am considering moving to another virus checker.

Hello Margo
I apologize for the inconvenience caused. Could you please let us know if you have installed the trial version of AVG Pc Tune Up? If so, I request you to uninstall AVG PC Tune Up by running the remover tool. Please click on the following link http://www.avg.com/tools#tba2 and select AVG remover. While running the tool, please select AVG Pc tune up from the options in the remover window. Please make sure that we are here to help you, if you still face any issues with AVG, please do not hesitate to contact us back.
Thank you.

Hello Margo
I apologize for the inconvenience caused. Could you please let us know if you have installed the trial version of AVG Pc Tune Up? If so, I request you to uninstall AVG PC Tune Up by running the remover tool. Please click on the following link http://www.avg.com/tools#tba2 and select AVG remover. While running the tool, please select AVG Pc tune up from the options in the remover window. Please make sure that we are here to help you, if you still face any issues with AVG, please do not hesitate to contact us back.
Thank you.