There have been a few posts over the past 2-3 days regarding this, all with Webroot.
In fact, there is no malware in any of Stardock's apps downloaded from Stardock's servers. What Webroot is reporting is a "false positive": A virus being present when in fact, none is. Webroot then isolates (or quarantines) the file it misidentified rendering Fences nonfunctional.
I believe Webroot also gives no way to "whitelist" the misidentified software...unfortunately. You can try unchecking that misidentifed SD_services_x64.dll safely. Maybe that will allow you to continue using Fences.
Were I you, I'd notify Webroot Support as I have.