What's going on? After installing GTX 1080 I can't change KMPlayer settings

After installing my brand new Geforce GTX 1080, using my 4K Samsung SUHDTV as monitor, I can't open KMPLayer interface to chance settings. The Control Panel looks small and all scrambled and don't let me to maximize. What is happening? I have changed to all possible video resolutions without results. What can I do? Thanks in advance. Sorry if my english is not that good. See the attached file to know better the situation: https://www.dropbox.com/s/tkuxpx2cfpf2h4x/Image%202016-12-01%20at%2019.49.59.pdf?dl=0
 
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