Hello, my GeForce FX 5600 is detected as PCI, in the Adapter Information on the detonator control panel it says "PCI x0" as the bus and my card is AGP. Also when I open cpu-z the AGP section appears in gray. Help me please. Thanks.

if you look in the Device Manager under Hardware>Display Apaptor you'll see the same thing. I'm on a system made of old parts (gigabyte GA7VRXP 2.0, XP 2200+), my ti-4600 is most definately AGP but appears as : Location PCI bus 1, device 0, function 0. Remember that Device 0 is the first device on the PCI bus. On my newer Asus nforce chipset mobos the video card also shows the same locations.
If you're having video acceleration problems make sure that fast-write is turned on in BIOS, you have the latest chipset and video drivers as well as the latest version of DirectX installed.
Otherwise as long as it's working properly I wouldn't worry about it.

Update ur motherboard drivers, you have no AGP drivers installed as ur card is running in PCI mode!

Thanks, I just downloaded the AGP drivers and it fixed it.

you know the problem PCI1 slot uses the same IRQ as AGP slot ?
now you know why .... because its the same "line" ... the only thing the driver does is to rename for better appearance