So far so good.
the driver is in. And the Microsoft Security Esentials ran a full scan without any issues.
I'm now debugging my event viewer for that one error.
The server {E10F6C3A-F1AE-4ADC-AA9D-2FE65525666E} did not register with DCOM within the required timeout.
I found a few hints, but not the right one yet on the net.
Once that's done I plan on slowly installing back some of the software that I always use.
Email, FTP, Photoshop and Lightroom
When all is fine after that the more System intensive tools.
When everything is fine I will try the graphic card again.
What do you say.
Thanks for all your help.
Really appreciated.
.. continued...
Just noticed this warning after a longer system run:
WHEA-Logger - Event ID: 21
A corrected hardware error has occurred.
Component: AMD Northbridge
Error Source: Corrected Machine Check
Error Type: 28
Processor ID: 0
The details view of this entry contains further information.
This sounds more serious. What I found so far by internet search was, that it might be related to a defect in the CPU. Hope that's not the case. Didn't find a clear answer yet.