Solve : youtube full screen problem??

1.	Solve : youtube full screen problem??
Answer» hi, my english bad SORRY.... i have two computers and one of them gets this problem When I WATCH a video on YOUTUBE, it is not full screen. i use chrome, firefox, opera but all have the same problem. there is the same problem with different videos i'd try, GRAPHIC card uninstall, reinstall chrome delete and again installl computer scan for virus and malware I showed the error in the picture and When I watch a video on YouTube, it is not full screen [attachment deleted by admin to CONSERVE space]

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