I have the exact same problem. It occured after a Windows Security Update for Windows 8.0 last week and from what I have seen in other forums, others have experienced the same at the same time. They have been recommended recovery of earlier state, but it is not an option for me.
My own IT dept recommended me to look fpr updated drivers on HP, but I'm damned if I can find any at this site anymore for my EliteBook 8530w. No updated drivers are found for old EliteBooks what I can see.