1. Was your Fences 4 program in contact with other infected programs in the last 2 weeks?
2. Was your Fences 4 program installed at least 6 folders away from all other programs?
3. What was your CPU's temperature when you downloaded Fences 4, was it running hot?
4. Sometimes when dealing with Virus's we error on the side of caution. Fences 4 is a safe program, this sounds like a false positive reading to me.
False Positives can be tricky. It is always good to do some research on your own, i.e. the BBB or other trusted sites to check the credibility. That way you know if you have a serious virus or just allergies going on. With False positives, just add them to the exception list on your antivirus. Sometimes you also need to restore the file as well to take it out of quarantine.