Unable to update Virus Definition on AVG Internet Security

Dear Support Team,

I can not update the virus definition as it keeps showing "Unknown error" when I perform updating, please fix it.

Thanks,
Alvin

Alvin,

Sorry to hear that you are getting error while updating virus definitions. Mostly this issue will occur only when the update files gets corrupted and we need to reinstall AVG Ultimate completely to resolve it.

Please follow the instruction ( http://support.avg.com/SupportArticleView?urlname=How-to-troubleshoot-issues-after-upgrade-to-the-latest-AVG-antivirus-product ) to run AVG Clear and Remover tool. Use the download link to install AVG Ultimate as mentioned in step 2. We are here if you need further help.