Thanks a lot for your prompt feedback!
1) It is not so easy to return, because I bought in Germany, but live in China. I would love to, but probably I will give away as a present, but first I need to know myself that it runs.
2) I really hope that Matrixgames takes this up with K7 Computing (Firewall K7 Total Security) as soon as possible. It cannot work without. If I only would forget to switch off even if DW is not running it deletes the exe-file after approx 5 to 10 minutes. And K7 mention about themselves they are the bestselling firewall / antivirus software worldwide, so Matrixgames should be interested in. Thus: Dear Matrixgames - please take this issue up with K7 as suggested by Kayoz! Thx!
3) I did both, manual and online update (at different installations) and also no update at all. No luck in any constellation, always deleted by K7 - or finally crashed. So I had DW alone in versions 220.127.116.11, 18.104.22.168 and further online updated. I also tried 1.7.06 in combination with Return of the Shakturi - as it is and also with updated Return of tzhe Shakturi.
4) Sorry, yes, it crashed. With deactivated K7. Maybe Matrixgames can see with your suggested 5), the DxDiag, a little more. I will now try to attach it.
Thanks a lot for your hints!
Hopefully they (Matrixgames) will take point 2) up and also find out something with my DxDiag!