Media Player Classic won't start

Hi there,
I've been using MPC for a long time because it is my favorite player, but it simply doesn't start anymore =/
I tried to reinstall and update K Lite Codec, nothing...
The wierd thing is that the process is created and stay there, but nothing happens...
Does anyone know how I can solve this? I don't think it is a Codec problem since the video plays on Windows Media Player.

Thx for the attention,
Roberto.

Does it also happen when you click on the MPC shortcut in the start menu, instead of double-clicking on a file in Explorer? You must terminate the existing process before trying, because new instances won't work if a frozen instance is already active.

Did you recently install any new security software, such as EMET?

There also is a known compatibility problem with the latest beta NVIDIA driver. Revert to the stable driver if you are using the beta.

Yes, it happens if I open MPC using the shortcut, not only when openning a file.
No, I haven't installed any new security software.
Maybe my problem is with the NVIDIA driver, I've updated my driver through Dells website, maybe they are using the beta driver... Don't know how I can revert back to a stable version =/

Dell only uses stable drivers. But they may be old. It is always better to get drivers directly from the manufacturer. You can get the installer of the latest stable NVIDIA driver at
http://www.nvidia.com/Download/index.aspx?lang=en-us

Try adding mpc-hc.exe to the exclude list of your virus scanner.

None of the options worked for me =/

I have no idea what causes your problem.

I suggest you uninstall the codec pack and then do a fresh install. At the very beginning of the installer, select the "Advanced" install mode. That will allow you to specify where things get installed. Instead of the default location, change it to something else, for example "C:\Program Files\KLCP". That might help in case something was blocking MPC-HC.