I use win 10 with PT12 and AVG and Spybot S&D and spybot Anti-Beacon (Anti-Beacon A must for win 10 as MS is using win 10 to send back all kinds of info to themselves. I also suggest you go to "settings" then "privacy" and go through all the left column items and turn off all of it) since win 10 came out and have had no issues even when I got the helix still no issues... win 10 is excellent! I do recommend after the upgrade from 8.1 or 7 that you do a complete reinstall from scratch (clean install) if you can but 9 x out of 10 all machines I have done work good with just upgrading. IMHO avast sux... never liked it.