thanks for your help!
I did the three steps yesterday.
Now my STARTUP is completely clean and I've uninstalled the programms you've said.
This morning I had a freeze. I startet the PC and left the room. When I came back about 10 minutes later it was frozen. I didn't do anything. No mouse-moving, nothing.
The events from this morning (13 errors) are attached. I hope you can open them ...