I’ve tried used Task Scheduler from Control Panel, without success. I cannot find instructions on the program itself? How does one instruct Avast 4.66 to automatically do a nightly scan with pre-set settings of all drives to scan?
Did you first read the avast! Help? What OS are you using?
Schedule automatic scans in Home version: http://forum.avast.com/index.php?board=2;action=display;threadid=3796
In Professional version, you can do it easily with the avast! Scheduler 8)