According to an article at Channel Web a recent update offered for a driver update for IDT (Formerly Sigmatel)'s high definition sound is causing problems for Dell Users that have installed it....The update is called IDT High Def Codec and was reported to be one of the drivers that held up the release of SP1 for Vista back in February. If you have a Dell computer and have not yet installed Vista SP1, you may want to take a look at the full article.