why is it that when ever i pull up youtube and start playing a video the screen freezes....

It's just the one window with youtube. the video will still keep playing and i can pause it and everything that you normally could do it's just frozen in one position. and if i close a tab open in the same window as the youtube window the whole thing will go white......

I recently cleaned a bunch of stuff off the hard drive and i thought it would help but it didn't do much.....It's really being a bother any help would be so appreciated! oh and i have a macbook pro if that helps, it's a little older...


THANKS A MILLION