When you start Windows, you receive an error similar to:
File is missing or corrupt: C:\Winnt\System32\Drivers\Pci.sys
To restore the file, perform an in-place upgrade or expand the file from the
Recovery Console:
1. Start the Recovery Console.
2. Select the installation you wish to access.
3. Type the administrator password.
4. Type MAP to determine the drive letter assigned to the CD-ROM.
5. Type Expand <CD-ROM DRIVE:>\i386\pci.sy_ c:\Winnt\System32\drivers /y. You should receive:
pci.sys
1 file(s) expanded.
6. Type exit.
NOTE: c:\winnt should be replaced with the location of your Windows installation.