Jerky, laggy graphics on windows 7 on macbook pro but graphics are fine on OS X

I installed windows 7 and all the apple support files for windows using bootcamp on my brand new macbook pro 15inch.
I get very noticeable laggy, jerky graphics on videos that i play with VLC or windows media player in Windows 7. 
If there is motion in the video you can really see it is not smooth.
and the quality of the display of youtube videos is much better on OS X than on windows but not jerky.
BUT if i play exactly the same files on OS X mountain lion they play perfectly,please help.
The apple support files for windows are up to date as well - I checked.
My Spec is Windows 7,
And the most recent OS X Mountain Lion.
2.6Ghz quad core Intel i7
16 GB RAM.
and the rest of the normal spec for a brand new macbook pro.
Any help would be massively appreciated.

Uninstall the graphic drivers you have, then download and install these.
http://www.geforce.com/drivers/results/59645

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