Screen keeps jerking when in windows

Hello,
Firstly I'd like to say that I have a computer connected to an LG tv as my monitor. Also I'm using windows 7 ultimate. My graphic card's a radeon 8570/8750 I forgot.
When I'm in windows (firefox, vlc, msn...) my screen would start to jerk after awhile and just keeps spiking. I would say that it's the problem of the tv because even the start bar below jerks?
However when I alt tab into full screen programs (dota etc) the jerking stops. So if the problem lies in the monitor why would it stop once I switch to full screen programs?

Help needed asap thanks!
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  1. i apologise it's radeon 7850
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