0o, that must be strange looking lol, have seen that in a few games though.
Check your Fans, make sure they are clean, if your system is getting hot due to non-proper airflow, it can cause strange things like that.
you may also want to try Start MEnu > Run
Type: Dxdiag
Once in DXDiag, goto Display tab, there should be a button next to an options called AGP Texture Acceleration, click it to disable, then try the game again.
Lemme know.
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