Have you Google'd your PC make and model for driver issues with SP1? That is how I figured out that some of Dell's laptop audio drivers had a conflict with SP1.

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Taylor Otwell
Member -- Oak Cliff Baptist Church
Fort Smith, Arkansas, USA

Did we ever hear any cry out on their deathbed that they have been too holy, that they have prayed too much, or walked with God too much? – Thomas Watson, The Godly Man’s Picture