Internet sound problem

I was looking through some buddies mahspaces, and then, all of a sudden i hear a slight scratch, and the music from his profile ceased…i went to youtube and my profile and i couldnt hear my song, and the videos at youtube would load but wont play, and have no sound neither, i cant here my instant messaging chimes neither…but i can still listen to my music on winamp…wtf???

if all else fails, system restore! hope you had it on.

I restarted the computer and it works…