Maleware not detected by Norton 360

IE, Firefox and Opera where hijaked by SpeedBit Video. The homepages were changed without my permission to a third party search engine (advertisement and data collection). NORTON didn't recognized it as maleware.

 

What's the standard procedure for such cases?

IE, Firefox and Opera where hijaked by SpeedBit Video. The homepages were changed without my permission to a third party search engine (advertisement and data collection). NORTON didn't recognized it as maleware.

 

What's the standard procedure for such cases?