Faces look transparent

Hey everyone!
If somebody has a clue why everytime i start sketchup all my faces look transparend even the guy? i didn’t add any styles or anything its how its starts and if i reverse the faces it looks ok but it flickers.please help!

Try updating your graphics card driver. Check that SketchUp is using your Nvidia card.

all is up to date and my sketchup is using the graphics card but it s not working