I have just finished playing hell to get an AntiVirus of any kind to run on this "Technical Preview" and finally found that Avira works with no issues. I tried those AV's that I had licences for first, Norton Security and Kaspersky, both of which had "compatibility issues" when installing. I tried then to use Bitdefender after trying to run the two previous AV's in every compatibility mode W10 offers. Bitdefender would just hang during install, which makes me think there was another issue. However, after several attempts I gave up and moved on to the next install, which just so happened to be Avira and it went without a single issue. I don't like to upgrade without having an AV installed before updating and fixing issues out of fear of getting something I don't want. So, to save some of you some trouble...Norton and Kaspersky have issues with "compatibility" and Avira runs right out of the box...and it is free. By all means let me know if you all find a way to get Norton or Kaspersky on Windows 10...until then I use Avira.
http://www.avira.com/en/index
