No flashback at all

Hi

With video module everything works fine, but not in ie8.
I've tried everything. But nothing happends.

This is what i have and what i've done

Modules installed and enabled:
Video 7.x-2.10
Video.js 7.x-2.3
JW Player 7.x-1.0-alpha1+11-dev

My configuration on admin/config/media/video/players

for mp4 files
HTML5 player
Plain HTML5 video player with Flash fallback

Player settings
JW Player presets 8a preset set)

In my libraries i have
/jwplayer
-jwplayer.flash.swf
-jwplayer.html5.js
-jwplayer.js

/video-js
-video.js

When i go to my video i see:
No flash player has been set up .... in ie8

But JW player has Flashback, right?
if i change html5 video player from Plain HTML5 video player with Flash fallback to Video.js Nothing happends in ie8

if i change player to SWF Flash Player
nothing shows up not even in firefox, chorme, etc

so my questions are
I'm setting this up well?
Have i the right path to the libraries?

I just upload a mp4 video and it plays good everywhere but not in ie8, i see no flashback at all.

I'm close to kill myself :)

Thanks in advance to anyone can help me