The game Black has the same problem. I'm not sure this works for GOW (never tested it), but this works for Black:
Advanced Settings and Hacks - Round sprite: Full.
Hope it helps. If not, try experimenting with the settings related to sprites.
Thank you for your report.
This bug report has now been marked as Invalid since it either was not reproducible, not a valid bug or otherwise unacceptable for fixing.
This thread will now be closed and moved in the Invalid/rejected/duplicate bug reports subforum.