audio / video multithreading issue

Hi,

I have almost clean win7 system + drivers from this site on my Vostro 3560.

The problem is: when I play audio in one of my internet browser, sometimes I can't play audio in the other one. Same about tabs in one browser, same about youtube videos. It isn't permanent, but rather frequent. It needs to reload a tab like 10 times to make it work.

I have tried a lot of different browsers and have done everything about cookie / cache / codecs.

There is teamviewer installed, it's strange when I turn this program off - sound is turning off instantly in browser.

I don't want to install win 10 because last time I tried there was big problems with drivers on my laptop.