I cant watch videos online or offline on my Alienware15 R2

I'm a streamer and i use my laptop to do live streams on twitch. The other day when i tried to access my streaming software (Xsplit broadcasting) it kept constantly crashing and ti finish loading up. Then afterwards i went on YouTube to try and edit one of my uploaded videos and the video failed to play, it kept saying that a plug-in (shockwave flash) stopped responding. also, when i try to watch video on thw movies app i just gives me a loading screen and fails to play. I don't really know what to do at this point. Can someone please help me?