You're seeing rolling shutter artifacts. You'll have to correct the rolling shutter first then slow down the footage. If you have CS5.5 you might try the warp stabilizer first then render, then apply Twixtor.
Aside from what Rick said, this could be a normal side effect/ limitation of how these kinds of things work. If there's not enough motion difference in screen space, this would cause unstable directional computations, resulting in these wobbly artifacts. Tweaking the parameters or using features like mask input in Twixtor Pro might help to get a handle on these kind of things....
i tried to slow it down to 10 percent
Ten percent of the original speed? In addition to the other gents' always-wise advice, let me add that slowing something down by a FACTOR OF TEN won't get you very good results. You're asking the software to invent a LOT of brand-new frames based on very little information.
Twixtor's good, but I don't think it's THAT good...
If you absolutely, positively MUST have nice, smooth slo-mo, there's only one tried and true way to do it: shoot at a high frame rate, which may necessitate shooting with a different camera.