[UPNext]

I had this problem in the past and the firmware upgrade for my CD drive corrected the issue. I would double check to be sure you have the latest version of firmware. Also, you mentioned that you did "a couple" of restores. If the first restore did not help did you revert back to the state you were in and then try to restore to an earlier time? How far back did you have to go to get back to an operational state? It's possible that you have undone your Hoster upgrade. If it were me I would follow Dale's advice and go through each step, firmware upgrade, Microsoft updates, Hoster upgrade and verify that your system is where you think it is. Then if you still have the problem you can rule out those issues.