Two nVidia graphics cards - one built-in, the other discrete. "They interrupt each other's drivers." What to do?

Question

Iron

Good afternoon.
There is a computer with Asus M2N-MX motherboard, nVIDIA nForce 6100-430 chipset. Windows XP sp3.
And there is a discrete vidyuha - GeForce 210.
On the nvidia website, I download firewood for one and the other vidyahi. Under the built-in - firewood with version ~ 308, for discrete firewood version ~ 350. I put some firewood - others fly off. That vidyakha works, on which I put the last firewood. So the firewood is not compatible, they are different - but it turns out to be overwritten. And - I put firewood on the discrete - if I put the built-in as a priority in the BIOS, I boot from it (with the built-in), then the firewood flies accordingly from the built-in ... although it is plugged into an integrated vidyuhi.
How to make two nvidia vidyuhi friends?
P.S. When I plug in the AMD HD 6570 radeon, everything works fine. Two vidyuhi, two monitors, desktop extension. All right.