I recently (late last week) spoke with a Symantec Customer Support person (he was in Chenei in India) and he advised me that Norton Utilities and Norton 360 are not compatible with the Surface Pro 3. Asked him about Norton Anti-Virus and he was not sure. He told me to be safe and not install any Norton Product on my Sp3 as he thinks they are not compatible and wil cause problems. He seemed to be a very friendly and knowledgeable person and I have taken his advice. Also I went off of Norton products a long while ago anyway. I would suggest avoid Norton like the plaque on the Sp3.