psellery

Hi, I was wondering if anyone has had a familiar problem or knows how to help.... I have windows 2000 and my brother accidentally managed to restore the default settings. I used to listen to music through headphones (as i don't have any speakers). However, i seem to have lost sound and the images and videos are blurry (even my wallpaper on the desktop). I'm no computer wiz but i've tried to look at the settings etc to sort out the problem. I'm completely stuck and can;t seem to get things back to how they used to be. Can anyone help? Thanks