How often to run AV system scans?

Usually once a week.Unless i've been surfing a little more dangerously then normal.Then i'll sneek in a quick scan.

 

once a week or when i have spare time

 

I scan every time i install a newer build of my AV (beta usually, so can be everyday sometimes... just to look for bugs).
Other than that, if there are no newer builds, i dont scan my PC... I suppose if my AV didnt upload/release any newer builds, I'd do a scan every 2 months.

 

It's worth mentioning that if the computer in question is likely to be used by several people, some of whom may be visiting goodness knows what sites, then scanning every night or once a week may be justified or even advisable.

My comments were based on the assumption that the computer is used only by the owner, or other trusted individual, so it is unlikely to be placed at greater risk.

Also I am referring to full system AV scans; people will often do additional 'quick' scans using an anti-spyware scanner, and that takes up so little time and energy that it would seem to be a good compromise solution for those who like to scan.

 

Only scan once a month more or less, sometimes less...

 

About once a month... if even.

 

I've been going from 1 month scans to 6 months scan as I haven't had a nasty on my system in over a year.

 

I don't do full scans unless I had reason to think I was infected so very seldom do I do them. I also have not used the Avira real time monitor since the April 19 upgrade. I don't even have that installed. I use Avira as a right click scanner for all files I download.