I wanted to use ddu in safe mode as it is supposed to be used.
I found using msconfig an easier way to get into safe mode.
Once I got there I was supposed to login to my account but I couldn't because as it turned out I should remember my first damn password I used for this computer when I installed Windows.
So I was stuck in safe mode, that was my problem, as you can see in the title.
I found the commands on the internet, they worked for others.
If you don't know what the hell I'm talking about why the hell did you reply?
Never mind, someone from an other forum understood this same post clearly, and helped me.
The solution was creating a Rescue media with Macrium Reflect (free version does the job) and boot the pc from that. Select Restore -> Fix Windows boot problems -> follow the wizard, then let it restart your PC. Done. FU Windows!