Yes, when I was in the control panel to reinstall it I meanwhile went through the list to make sure that I dont have any anti-virus/spyware/adware.
After reinstalling the game the same problem occurs sadly. I really have no clue what could be wrong, I am sorry that I can't help so much :/ I really appreciate your help though.
Is it only Gyazo pictures you cant see on your comp? Will it help if I post it in Imgur?
I send a link anyway with some pictures of some things that might give some clues: