Flickering for two problems. First problem, my model glitches whenever I'm holding an object with my characters hand and I'm using a weapon with my right hand that requires both hands (seen in video, with both gravity gun and ARC9. Second problem, my flashlight is flickering as seen in the video.

Hello, I have problems with my garry's mod, every time I open the game it gives me a black screen and then it closes I have already tried everything to solve it but it does not work P.D: here is a video I made demonstrating what happens