Installation problem

Hi Gavin,
We understand your concern and to fix the issue you need to uninstall the old traces of AVG(if any). Then please restart the PC.
Then Please follow the below link to start with the installation of AVG Ultimate.
http://files-download.avg.com/inst/mp/AVG_Ultimate_761.exe

Thank you.

  1. Restart your PC when the restart option is displayed on the remover tool screen.
    4)Once you have logged into your PC after the restart, please go to C:\ drive and delete the "AVG REMOVER" folder manually.
    Note : Please use the AVG Remover tool mentioned on the article to uninstall the AVG program more effectively.
    If you are still facing any issues with installation, please get connect with us we are here to help you.
    Thank you for understanding.

I have spent more time on this now - two hours. 

I have tried turning off the Windows 10 security, but that makes not difference. I am still unable to install AVG Ultimate.

The warning I get reads: 'Action is not allowed. Currently used product version does not support this installation. Please uninstall current product and start installation again. Error code 0xe001f98d'

Hello Gavin,
We have sent you an email with instructions to collect the diagnostic information and analyze this issue.
Please feel free to contact us if you have any difficulty with the email instructions.
Thank you.
  1. Restart your PC when the restart option is displayed on the remover tool screen.
    4)Once you have logged into your PC after the restart, please go to C:\ drive and delete the "AVG REMOVER" folder manually.
    Note : Please use the AVG Remover tool mentioned on the article to uninstall the AVG program more effectively.
    If you are still facing any issues with installation, please get connect with us we are here to help you.
    Thank you for understanding.

User-added image
Here's the screen I get… Thanks for your help, if you can. Gavin

This is what I did - and it still has not worked. Can you help me further please?

Gavin Atkin

Hello Gavin,
We regret the inconvenience caused. We would request you to remove previously installed AVG program traces from your system using AVG Remover tool and then try to reinstall AVG Ultimate.
Note:If you have installed any other Antivirus  programs like AVAST, NORTON, MCAFEE or KASPERSKY, Please uninstall it first to avoid conflicts when installing AVG.
Once you have uninstalled from your system,try to follow the steps which mentioned below.
Remover and Download:
1) To download AVG remover tool, please click on this link: http://support.avg.com/SupportArticleView?urlname=How-to-reinstall-AVG
2) Run the downloaded file and follow the onscreen instructions.