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Hi....While I don't know why this has happened specifically, you can try performing a repair installation and then try manually updating avast. Just go to the Control Panel, click on "Add/Remove Programs," and then avast. When the menu options appear on the left (in the window that appears after clicking on avast,) scroll down to the, I believe, last option, "Repair." If the problem isn't solved after performing the repair, you can try uninstalling avast with this tool...http://www.avast.com/eng/avast-uninstall-utility.htmlThen download and reinstall avast from scratch...http://www.avast.com/eng/download-avast-home.htmlIf you didn't save your registration key (e-mail,) you can apply for a new one here...http://www.avast.com/eng/home-registration.phpHope this helps. Best Regards...