PCI Device not found

Recently my Inspiron-6000 has got a serious problem with virus. So I have formatted the laptop and installed operating system once again. Later I remembered that I don't have driver's software CD. So I have downloaded the Driver's software from internet and installed. But my system is prompting me for one more drive like PCI Device not found. Every time when ever I am turning on my system a message is coming that PCI Device not foud. There is a yellow color question mark in the device manager screen saying that PCI device.

 

So could anybody tell what is this PCI Device? Where will I found the software for the device driver?

 

I have installed widows XP sp1 operating system.

 

Thank you for the reply...