Sry - I have been away for quite a while now.
Yesterday an today I have been trying to fix the Problem.
I did not yet use the procedure sylvia told me.
But I still found out some very interessting facts:
1. If system hangs at bootup, it's while you can see the Intel POST-screen with bootcode "5A". In other cases it hangs at the blinking cursor after that POST-screen (befor Windows boots up)
2. If the seventh core in Windows is at constantly 100%, the Tool "Process Explorer" tells me, that "Interrups (Hardware Interrupts and DPCs)" is causing that Problem. One problem with that is, that Interrups does not seem to have a PID and I cant kill it.
But still - core #7 is not at 100% everytime i boot up. It seem to hapen at approx. 1/2 of the time I start the PC.
The tool "LatencyMon" does meassure DCP execution times an reportes "ntoskrnl.exe" or sometimes "tcpip.sys" to be the guilty ones for delaying the DCP executions.
Well - I tried fixing this with deleting and reinstalling Windows7 (till now without all the third-party drivers). Without the drives on the freshly installed Windows core #7 is still at 100%...
Now i will install the drives and see what happens. I you have any ideas how to fix this, pleas post it.
Kindest regardes
mitras2