windows 10 hosts file entries been commented out

To prevent the hosts entries from being commented out by Bitdefender 2016 do the following:

In the main Bitdefender interface click on the human icon (from the upper right corner) and choose General Settings > Advanced tab > "Scan hosts file" button.

Sul,

Cause: Bitdefender Total Security 2016 is causing this problem

Fix: Right click on hosts file, properties, security, give only read access to "ALL APPLICATION PACKAGES" user/group.

Reference: http://www.bitdefender.com/security/hosts-file-hijacking-becomes-impossible-in-windows-8.html