nvidia nforce 4 drivers

[Sampah]

I'm using a Nforce 4 motherboard and using Nvidia Nforce 6.86 drivers but strangely it doesn't install the drivers for PCI Xpress, it use standard PCI bridge driver from microsoft instead, but if I try using the CD driver that comes from the mobo manufacturer, it works, it uses it's own driver instead using standard driver, so did I get the wrong driver? I using ECS Nforce4 A-939.