Screen twitches in skyrim! (The Elder Scrolls 5: Skyrim)

in general, when cornering, the screen twitches very much! changing the graphics settings does not affect, both at 50 fps it jerks, and at 30! tried both the smallest settings and the biggest - nothing changes! it's just impossible to play .. and here's another, the jerking disappears if I turn on fraps on the record! immediately everything becomes normal ... so I think what is the reason! help people kind, knowledgeable)) for example, GTA 4 is almost at the maximum, Mass effects are all at the maximum, the metro is at the maximum, the battle is the same ... in general, the problem of current in Skyrim manifests itself!
i7 - 3612qm 2,1GHz
8gb Ram
AMD Radeon hd 7670m 1gb
win7 prof