I have the Asus v7700 Geforce 2 GTS, and I tell you I have had loads of problems with detonator drivers and this card in the past. I have rejected a lot of drivers, simply because they screwed up one game while they fixed problems in another.
But the drivers I use know are giving me no glitches, no crashes and good speed. And I have been testing them for a month now.
So, I would recommend detonator drivers version 28.32 for all Nvidia Geforce card owners that are experiencing graphics problems in GP4.
Please let us know if they also work well for you.
It's only after we've lost everything, that we are free to do anything.