Please help to remove haali

Hi , all of a sudden when i play a avi file on windows media player the haali media spliter appears and i have no memory of ever installing it…It makes my avi’s in windows media player very slow and when i go ahead and uninstall it from the registry then the video plays fine but i get no audio…Im running windows vista ultimate.I would like my avis to play normal again under wmp 11…Please help ?

Try system restore.