Weird Blinking Lines on VLC

So ever since I got my new monitor, when I watch vids on VLC media player there are these horizontal blinking group of lines for about a second and it repeats every once in a while.
My friend said its something to do with the codec … right now I have K-Lite Codec Pack.
It happens more if I run it in a window…
Ideas?
Answer #1
Happens in any other player?
Answer #2
Hmm strangely no it doesnt happen in Windows Media Player but I dont like that one.
Anything I can to make it work in VLC?
Or how do I get rid of the bars on top and bottom of the WMP when in fullscreen? / How to change aspect ratios?