http://www3.ca.com/securityadvisor/v....aspx?id=32163 Takes you to information on what it is and why it's currently doing what it is doing, Sadly another instance of Microsoft's current knee jerk reactions to reported possible exploit avenues and not really looking into the implications of there updates and as a result in this case causing a lot of people a lot of problems, still the offered KB935448 hot fix does actually solve the problem for Realtek system users.