system32\DRIVERS\pci.sys missing or corrupt

Hi I'm afraid I'm a bit of a computer idiot and I'm completely stuck! When I turn on my desktop it doesn't load up and just goes straight to a black screen whch states that the file system32\DRIVERS\pci.sys is either missing or corrupt. It goes on to say I can attemp to repair the file by using the original windows setup cd-rom. However I have had the computer for about 4 years and there has been a few house renovations in that time so I have no idea what cd-rom they are talking about or where it might be! I haven't installed any new hardware or software recently and the last person who used the computer said it shut down with no problems. Does anyone have any advice about what I can do?!

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