Click on START and go to "Control Panel" the click "Find and fix Problems," then follow the instruction. 

If that does not work try going  to "Restore" and return you PC back to a time it was working properly, WBMS

One can download a free You Tube Converter, to change it to an MP3. for one

If you want to hear some really great A Cappella Singing, go here and hear some world championship singing. 

Go here..... http://barbershop.org/  Then click on the 75th Anniversary link.   Then click on "Watch more barbershop" 

 http://barbershop.org

Judging on what i see, It seem most people want to by Irish on ST PATRICK'S DAY

I do not see that same enthusiasm when I honor Martin Luther King on his day   ;-)