PCI Bus

[Damage]

Under my device manager and Sytem Devices is my Pci bus. Next to it is a yellow excamation point. When I double click on the device Windows sais that the device is not working properly. Any PCI card besides my graphics card doesn't work. I have a MPEG2 decoder card and a Sound Blaster Live card that do not work on my system.(I tried the SBLive on a friends system and it worked) Windows fails to even detect either of the two cards. What is wrong? I would appreciate any help.
Thanx

[fernando_lisboa]

It may not help, but when that happend to me I removed the PCI device (from control panel), restarted windows, and as soon as it started again it would look up the new hardware. If that doesn't help, try to set your "Plug and Play devices" in BIOS to "AUTO", and "Plug and Play OS" to "YES".