The program can’t be moved (unless you are talking of moving the installation file), it has to be installed or the registry keys, etc. won’t be present and there is a registry key involved in the action of scheduling the boot-time scan.

So I would suggest a clean reinstall (assumes you are using the free version):

  • Download the latest version of avast, 6.0.1289 http://files.avast.com/iavs5x/setup_av_free.exe and save it to your HDD, somewhere you can find it again (if you didn’t save your last download). Use that when you reinstall.

  • Download the avast! Uninstall Utility, aswClear.exe find it here and save it to your HDD (it has uninstall tools for both 5.x and 6.0.x).

    1. Now uninstall avast! (using add remove programs, if you can’t do that start from the next step), reboot.- 2. run the avast! Uninstall Utility from safe mode, first for 5.x if previously installed and then for 6.0, once complete reboot into normal mode.- 3. install the latest version, reboot.