PC Tuneup install failure

Thank you for providing the screenshot, Andre.
I would request you to download and run AVG Clear and AVG Remover tools to remove traces of AVG completely and reinstall AVG TuneUp - Unlimited.
Click on this link http://support.avg.com/SupportArticleView?urlname=How-to-troubleshoot-issues-after-upgrade-to-the-latest-AVG-antivirus-product for steps to download and run the remover tools.
Then refer to steps in this link http://support.avg.com/SupportArticleView?urlname=Download-and-install-AVG-Performance on how to download and install AVG TuneUp - Unlimited.

User-added imageno other avg products installed.

Hello Andre,

I understand the inconvenience.
Share the (screenshot) of AVG installation error window to assist further.
You can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions.
Do you have other AVG program installed on your PC?

I have a message during installation of PC Tuneup  relating to avgui.exe
The application failed to start because its side-by-side configuration is incorrect…
Please advise if you have any ideas on what would cause this issue.
Many Thanks

User-added imageno other avg products installed.