Pen pressure

Hi everyone.

I have a big problem which I was not able to fix for a full week now, making me unable to paint digitally. So the thing is Photoshop doesnt react to pen pressure, while it does work on other programs like Paint tool Sai. I've tried a lot with settings, reinstalling, drivers and such, but nothing seemed to work. However, what i noticed is that in the preview of the brush it does show that it doesnt react to it, even though opacity, thickness and all that stuff is or isnt turned on. As in :

I would really appreciate the help, since I cannot practise or work on requests at the moment.

Yours,
Yari