I don't know if it helps you guys, because I have an ATI card (HD6870) with the AMD Control Center, but I had just reinstalled my SH3/Grey Wolves on a new system and found that I was getting the golf ball sun as well.
Only thing I did was change the AA from "Use Application Settings" to using the GPU's AA @ 4x; AA mode is set to Multi-Sample (I've got a Super Sample setting but haven't even tried it yet).
Anyway, after restarting the game I had the glare/halo back on the sun.
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