Restoring corrupt pci.sys to Avaya-branded server

I have an Avaya-branded server that runs Windows 2003 server and won't boot due to a corrupt pci.sys.  I tried the bundled 2003 Server disc, but it threatened to erase the C drive, which was no good, and when I tried booting with a standard 2003 server disc, it couldn't see the C drive to do any type of repair.  I can't even get to command prompt this way.  All I need to do is access the C drive and restore a good pci.sys file, and I SHOULD be OK, but I can't figure out how to do that.  Any thoughts?
thomsoneAsked:
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MidnightOneCommented:
Grab yourself the Ultimate Boot CD and a USB stick.

On another system, copy i386 from the Windows 2003 CD from the manufacturer to the USB stick.
Insert USB into server.
Boot server from the UBCD into its OS.
From a DOS prompt use the command COMPACT to unpack and copy pci.sy_ from the USB stick to %windir%\system32 directory.
Reboot server normally.
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