there are plug-in's that makes those adds go byebye.
do you have chrome:
https://chrome.google.com/webstore/detail/gighmmpiobklfepjocnamgkkbiglidom
do you have FireFox:
https://addons.mozilla.org/da/firefox/addon/adblock-plus/
do you have IE:
Adblock for Internet Explorer version IE7, IE8 and IE9 – Simple Adblock
it is not just youtube. but every site you can think of.
do you have chrome:
https://chrome.google.com/webstore/detail/gighmmpiobklfepjocnamgkkbiglidom
do you have FireFox:
https://addons.mozilla.org/da/firefox/addon/adblock-plus/
do you have IE:
Adblock for Internet Explorer version IE7, IE8 and IE9 – Simple Adblock
it is not just youtube. but every site you can think of.