Flickering in 2nd monitor when using Premiere

Hi there,

I'm set up on a editing PC with dual monitors. When using Premiere I get a strange flickering (kinda of artfacting/pixelating effect) on my second monitor especially if there is movement in the footage. I can work with it but it is quite annoying and I'd like to have smooth playback. This only occurs when using Premiere. Playback is total smooth if I'm playing video from youtube or vimeo or any other kind of video player. I've googled the hell out of it too no avail. I assuming it must be a setting in Premiere. 

Can anyone help?