Blendfile crash/fall down after opening/rendering/node editor opening

solved threat

No issues here. Can only suggest it must be a local problem.
The only error I can find is that the font file doesn’t exist, but I assume it is available at that location on your system.

You could try appending the objects to a new file.

Append yes, I thought about it. I will try it. File was previously alright. It crash now.