bug video - white view

hello, im starting play here and enjoy... but sometimes the screen put all in in white and i cant see where im going with my character.



its my pc to bad for playing? im try in all video configurations but not run good,i ever see in specal positions all the view in white, sometimes in little rooms but same in exterior maps.



please help me, can someone tell me how to solve this?

tanks!!



(so sorry for my english ^^!)