Why I can't launch MOP?

[Empirical]

Hey, it's been a while I've been playing Warmane MoP, but today I came here, and I could not launch the game for an unkown reason. So if someone could help me, that would be really nice..

[skullatbash]

can you provide more info? like what MoP are you using? ( "old" or with WoD model)
do you get any Error message? if yes provide a screenshot
you double click and just nothing happens?

[Empirical]

Alright sorry, I'm using the old one, no errors, I just simply open the wow (double click). The computers seems to be thinking, but then nothing happens..

[skullatbash]

I think the problem is caused by your OS, did you already try to restart your PC?
have you done some Windows Update between yesterday and today?
with Task Manager do you see the wow.exe process running?
try if other games have the same problem
do you have other WoW clients? ( I mean other expansion) if yes they are still working fine?