PC TuneUp Installation Error 0xe001f946 (AVG Ultimate)

Hello Deng,
We  apologize for the inconvenience caused.
We have sent you an email instruction to get connected with our technical support team. Please follow those instructions to get in touch with them and you should be able to resolve your issue.
Please feel free to get back to us for further assistance.
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There was a problem with the Ant-Viral Update, so I had to un-install and re-install Ultimate on my notebook running Windows 10. I now had a problem re-installing PC Tune Up despite several attempts, Anti viral was re-installed and could be updated.

I had tried to download the AVG_Remover program many times and it can't run. Concerning about viral from the removal program, I ran the AVG antiviral and it reported a Threat message: The file is signed with a broken digital signature, issued by: AVG Tecnologies CZ. 

Hello Deng,
We  apologize for the inconvenience caused.
We have sent you an email instruction to get connected with our technical support team. Please follow those instructions to get in touch with them and you should be able to resolve your issue.
Please feel free to get back to us for further assistance.
Thank you.