Hallo again

Formatting the computer went very well also thanks to your tips.
I had no problem with anything at all, Windows went allright, programs went allright, McAfee Firewall went allright, Internet Explorer and update went allright.
The last thing I did was updating McAfee virusscanner and now I have trouble. I get an errorcode:'unable to establish a communication link between the application and the devise driver'.The virusscanner stops every action.
Reboot gives errors, I can get McAfee off and evrything works again. But when I try again I have the same error immediately after updating
What else can I try? Does anyone know?

Greeting Harmke

If everything else has gone well and the only problems are caused by McAfee then personally, I would think about removing it and using another AV solution...

...just my personal opinion of course. You could spend weeks looking at a problem like this.