Preview and rendered video has distortion

Hi,
I have scoured this forum but can't seem to find my exact problem. I am getting very jerky playback (which I have seen in other posts) but mine is getting this odd green distortion too. The distorion seems to happen the exact same place every time in the preview and the rendered video. Last week this problem was occuring so I went and updated Quicktime and deleted my media cache in Premiere. Something seemed to help... for a while. Now the problem is back and worse than ever.
Below is a screen shot of what I mean... Any ideas would be greating appreciated.

Thank you Ann & Jim!
First, let me say you got me working. It was the video driver.
I did think of this before, but I went to Device Manager (Win7) and checked for driver updates there. There were none. But becuase you mentioned it, I pushed a little harder by going to Lenovo's site and downloading the latest drivers from there, not knowing if it's what I already have... It worked like a champ! Video looks pristine again.
Thank you, and please pardon my bone-headedness.
Just for giggles, I'm including my system specs in case it can help the next guy somehow.
Lenovo G560 (laptop)
Win7 x64
i5 Core (not 2nd gen)
4gb RAM

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