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I would advise a clean install to users to rule out corrupt installs.You need to perform a clean install:1.Download your version of avast! and the avastclear tool.http://files.avast.com/iavs9x/avast_free_antivirus_setup_offline.exehttp://files.avast.com/iavs9x/avast_pro_antivirus_setup_offline.exehttp://files.avast.com/iavs9x/avast_internet_security_setup_offline.exehttp://files.avast.com/iavs9x/avast_premier_antivirus_setup_offline.exeDownload Avast Clear Tool2. Uninstall Avast by control panel [If you don't have Avast in control Panel go to #3]3. Uninstall in safe mode using Avastclear. [Running Avastclear is normal mode will give a prompt to go into Safe Mode]Check : Once uninstalled check in device manager>view>show hidden devices if there is anything related to avast with a yellow triangle.. if so, uninstall it and reboot.5. Install the version you downloaded.6. Reboot.Free: If you have the Free version, register the product for free for a year from the avast! UI.Paid: If you have a paid license, insert the license key/activation code after the reboot at stage 6. If you have any questions, please don't hesitate to ask. It's better to ask than make a mistake and start over again with the process.
Same problem... I upgraded Windows 7 do 10 yesterday, and then updated avast immediately and everything worked just fine until few hours ago...