Disconnected from srever at 90% loading screen

This problem has started today when my Wow din't recognize my wow.exe
After that I have deleted wow and downloaded it again .When I turned it up again I tried to enter the world and then .... I got dissconnected at 90% loading screen. Afterwards I checked to solution on the internet and I lowered my graphics then When the loading screen finished it kicked me after being a second in the game . I just want to know how to fix this problem
Realm.Neltharion

Thanks for your help :)

this probem happens only with 1 Character or with all Characters?