I can no longer download Apps from App store nor update the existing ones

iMac 21" Intel
year 2013
OSX10.10.1
I can no longer download Apps from App Store.
I would select the app, press the icon to download the App (Ottieni in my language, Italian), download would not start and an alarm saying "Download failed, try from the Purchased page to retry" would pop-up, see screenshot below.
I would visit the page "Purchased" (second icon from right) and try from there by pressing the icon Install on the right hand side but the same pop-up icon would appear and a message by the icon Install saying "An error occurred" would appear.
The same problem occurr when I try to update Keynote, Imovie or any other App I have downloaded.
I do not know whether this is related to this issue but some time ago I installed Avast.
I could not install other apps such as uTorrent (not downloaded through App Store) until I removed Avast.
I am utterly disappointed.
Can anyone help, please?
Thanks.
Carlo

Yes, Avast could very well be the issue. Bad software, use the developer's instructions to uninstall and don't install again. Your Mac has no real need for most 3rd party anti-viral software and those so-called tune-up apps mess up more than they are worth. A pristine OS X system is all that you need, it takes care of itself.

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