hi all hope this is the right forum to post but was wondering how often does avast do a full system scan today is the third and my last scan was on the 26th is this normal with the free edition or should I buy the pro in order to scan it everyday or is every day over kill. I realize that its runing 24 - 7 so it may not need to do a full system every day but I rather be a bit paranoid that get my system messed up. By the way I am planning to buy the pro version but am still checking out the benefits of the free version I feel its a great program and those who worked on it deserve the compensation for it and if a every day scan control is in the pro version to me its worth it, not to mention that this is a great forum thanks all didn’t mean to get off topic so back to my question thanks all.
Hi bigdog,
The option to schedule a scan is only available in the pro version, but you could run a manual scan in the free version any time you want. I think you’re right about daily scans being over kill, though.
Yes, the Pro version has full scheduling and automation of scannings 
Check This out - HOWTO: Scheduled Automatic Scans avast! Home Version!
The major disadvantage with the task scheduler trick of using ashquick.exe is, it will scan every file of the hdd, partition, folder or file that you set it to scan; even those files not considered a potential threat, this can take a long time. It is possible to add certain folders to the exclusions list for say your media files, etc. This could leave you vulnerable if that folder got infected as it wouldn’t be scanned by the on-demand scanner as you have excluded it.
The Pro version gives a lot more flexibility and the scan would follow the settings and exclusions, etc. of the regular scan.
With the different levels of protection of protection and the fall back of the Standard Shield, I find the need for daily scheduled scans lessened. I prefer to do a manual scan with my regular weekly maintenance tasks.