it all seems weird to me.
at first, i want to thank you all for helping me out.
the sad part is that even though i installed the "chipset" drivers, all it ever installed was ahci + sata drivers.
or example, when i click driver details on ATI I/O Communications Processor PCI Bus Controller, i see the pci.sys file that has been loaded. on ATI I/O Communications Processor SMBus Controller and the PCI standard host CPU bridge, i get the "No driver files are required or have been loaded for this device" message.
i'm starting to sound paranoid, right? well, i only like things to be settled and working as should.
anyway, thank you guys again for your replies and help. it's really appreciated.
(p.s. sorry for any bad english. it's not my native language )