First of all thank you for your reply, it pushed me in the right direction. After studiying the Windows event log a lot and trying different services activated/de-activted and so on i stumbeled upon an entry in the System event log. It was about "atapi device is not answering". Well, the only atapi device in my rig is the DVD burner which worked fine. So i replaced it with an other one and the issue is gone.
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