anyone got any solutions to youtube videos not playing in google chrome

[c=BF6900][i]i'm using windows 7 still, yes i know i know...but can't upgrade yet...and all of a sudden videos in youtube won't play whilst using chrome...i'm having to watch youtube vids in firefox instead, but chrome is my main browser with all my data.

can anyone offer me any solutions? would downloading ccleaner help?[/i][/c]