There was a problem with this in Avast a while ago with an update.You can try this and see if it helps.
1. go to control panel and uninstall/remove programs
2. find Avast and click uninstall/change{depends on OS but will be similar}
3.When the avast! Setup Wizard appears, select the option 'Update (Update components)
4.click next
5.After the update is successfully completed, click 'Finish', and then reboot your computer
The unsecured status should be gone