hahahaha we got the same problem....
read at the tread "PC PROBLEM"
i think your character is in MH or prison last time you played it?
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i have a solution for it.................
1.delete other programs/games in your pc that you dont need...uninstall them
2.in your display setting change it.....it is 32k change it to 16k
3.in your game resolution the shadows the effects and others turn it off or put them at their minimum