Get rid of S&D.
Seriously this is a false positive detection (this is the avast update process service) and you should report it to S&D.
S&D has long gone down in my estimation as a top notch anti-spyware, I abandoned it along with adaware years ago. The latest release of it was up to a point but this type of thing is doesn't help restore my faith, I guess this would be the resident element of S&D, which to me was the only value in retaining it ?
Yes all security applications suffer from FPs up to a point, but when I feel there are better solutions out there (SAS and MBAM) then I see no reason to put up with it.