The WoW client just auto-Alt-Tab

I dont know why but after I push on Wow.exe the client opens and just kick me out, if I try to re-enter he keep auto-alt-tabbing untill the end of days.
I used to cancell the process of Wow.exe and reopen it but now it works no more.
Thanks for the attenction
I used to cancell the process of Wow.exe and reopen it but now it works no more.
Thanks for the attenction