Its a weird and intermittent problem, it comes and goes with time. I thought I could fix it rebooting, but it seems that is not always. Take a look:

This noise keeps blinking at the screen the entire movie. If I give up and try again an hour from now, it will be fine... weird!

I have K-Lite Codec Pack installed, in my machine and many others. Its very cool, everything works perfect... but mine is the only one that does it. Do anybody know whats going on?

Edit: Apparently they've just release the very latest version of K-Lite today (lol), with some bug fixes. I'll be testing it. Last time I reainstalled K-Lite the problem was gone, but came back again...