you run the avast removal tool to unistall avast, when you tried to unistall the application before reinstalling it?
If you only unistalled it via the add/remove program then remenants of the application could be still left on your system, giving problems.
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browsing the avast web forum, there was an article about someone having problems updating their software such as what you were experiencing.
They ran malwarebytes and super antivirus and it solved their issue. topic=58194.0 Check the avast forum for other related articles.
Here's a link to the manual update: I realize this is not a fix, but at least you can stay up to date.
have you tried at least manually updating to get you by?
The proxy server hijack is becoming more common, so definitely check for that issue... Can you install other updates such as windows updates? Try using an update cleanup tool if you can't install other updates.
Did you try to run the avg and avast removal tools mentioned above, then reinstalling avast?
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