Return of Reckoning

I have no addons, i tried to install some to fix that but it still not working...maybe I'll try reinstall game :/

Hello,
The first of all i have to say i'm new player so I do not get all things yet.
I have an problem with targeting in game. It's all about targeting friendly characters and npc's cause enemy characters got normal sword icon to attack. I recognized on yt films that everybody targeting with mouse ...