NO SOUND

Hello,
i recently had an a problem with realtek see,
the program kept on adjusting the sound so u could barely hear the lyrics only the back ground music so..
i deleted the thing and then my sound icon was no longer in the space beside the time. Then I tested to see if it worked now by going on youtube and selecting a song and my sound was gone . i tried puting in cds and turning up the volume on the keyboard but nothing worked.I have tried going into my control panel and selecting to see what possibly could of gone wrong but the system keeps on telling me that my volume is working properly.I even tried downloading scaners but nothing is working please help me get my sound back...:(