Hello Bethan,
We apologize for the difficulties you are currently experiencing.
Could you please let us know the name of the AVG product you have installed in your pc? also provide us the screenshot http://avgclick.me/getscreenshot of the issue to assist you better.
Feel free to contact us for any further assistance. Thank you.
There was an errror with AVG so I uninstalled and tried to re-install but this error message is still coming up.
Bethan, Also 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