You have two ways to solve the problem of "Pci.sys Is Missing or Corrupt"
Error Message When You Start Windows.
1.Booting with WinXP CD to access the Recovery Console’s Repair option,
and then copy from WinXP CD the missing or damaged Pci.sys file to
Systemdrive:\Windows\System32\drivers folder , Exit and Reboot.
start the recovery console and type:
set AllowAllPaths = true
expand d:\i386\pci.sy_ c:\windows\system\drivers32 /y
If you don't type
set AllowAllPaths = true you can't access the windows folder.
2. Booting with WinXP CD and then perform a Windows XP Repair Reinstall
of the currently installed system.
If you need detailed assistance post with details of your Operating system
[WinXP Home vs WinXP Pro and the SP status i.e SP1 or SP2 ]
See
http://support.microsoft.com/default.aspx?scid=319136
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