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Hello Ross,
The installation seems to be corrupted and that is the reason you have received the error message during repair process.
Please review the following link and try re-install AVG.
http://support.avg.com/SupportArticleView?urlname=How-to-reinstall-AVG
Please feel free to contact us for any further assistance.
Thank you.

Hi

I have ran AVG repair in control panel and received: Repair failed 0xC0070643 General Error 0x0643.

Where to next please

Cheers

Hello Ross,
The installation seems to be corrupted and that is the reason you have received the error message during repair process.
Please review the following link and try re-install AVG.
http://support.avg.com/SupportArticleView?urlname=How-to-reinstall-AVG
Please feel free to contact us for any further assistance.
Thank you.

Other user ross butler posting (https://support.avg.com/answers?id=906b0000000DhbBAAS).
Ross, In future, to keep everything together, please try to keep the whole conversation in one question/thread to speed up any resolution. 
AVG Guru