Unfortunately sometimes malware and virus companies get things wrong, and this is one of those cases. I'd email them to let them know that this site is safe, or to let us know what specifically they are concerned about. Sometimes members link to an image hosting server for an image, and that server may sometimes to be hosting unsafe things. But we usually catch those issues, and/or your web browser will alert you to those rare times when it occurs. (As long as you don't visit the actual server, nothing bad will happen to you just from an image.)