Hi, 
I'm using Windows 10, with audio interface: Tascam 2X2 and Sonar LE.
I noticed that when "Sonar" software is runnung, Only then, things like videos from YouTube and videos from facebook or songs from my computer (MP3 etc), doesn't played.
 
I checked my ASIO driver that he is up to date, and even re-downloaded it again its latest version, everything remains the same.
 
Why??
 
Thanks!

Because Sonar takes exclusive control of your device. You can try changing this behavior in Sonar preferences but it's possible that your device driver doesn't support multiple clients.

So what if Sonar takes exclusive control of my device, still it should play thos things, not??
How and What exactly I changing this behavior in Sonar preferences??

Exclusive control means that ONLY Sonar gets access. So no, those other applications won't be able to access your soundcard at all.

So what can I do and defins so thos application can run two and played music when sonar is running?
It is totally paralyzing my computer!

Sorry to hear about total paralysis!
In addition to deselecting the "exclusive" setting in Sonar (as others have said) it might be worth going to Windows Device and Printers and right-clicking on your Duo Capture and choosing "sound settings". Make sure that the Duo Capture is set as the default device for Playback, then choose Properties - Advanced and de-select "... exclusive control ..." there too. Probably also worth doing the same for Record.
 
 

I want to clarify something, when you write "Duo Capture ", you're meening to my audio interface and not to the internal sound card of my laptop, right?
Because if it this way,
I tried to do it, and it did not help :(

It's a little unclear to me what you mean by " other programs not being played". I guess you mean they're silent but running.
Usually that is solved by clicking "Share drivers with other programs" in Sonars Options.

I already tru that two (Share drivers with other programs").
I mean that windows media player open but than there is popup error, on facebook the video didnt played at all(not just slient) and the same is happning on youtube.

You might try changing to WDM driver mode in preferences if your interface supports it. ASIO drivers bypass the Windows audio stack, WDM does not so sharing audio resources is likely to be easier.