Hae macbook pro pc side won't boot up (by 4 users)

I fixed the PC bootup on my MacBook Pro. Just re-formatted the PC partition and re-installed Windows XP. Thanks anyway.

Task: Enable my MacBook Pro to boot on the Windows side. It worked at one time. OK I got my windows disk to boot the windows side. I keyed "r" to repair as instructed, then it asks which drive. I select "1" (C:) as the only option. The DOS prompt goes to windows. What can I do from there? Thanks.

Attempting to start my MacBook Pro on the PC side, error message:

"Windows cannot start because the following file is missing or corrupt:
system32\DRIVERS\pci.sys
You can attempt to repair this file by starting Windows Setup using the original Setup CD-ROM.
Select "r" at the first screen to start repair."
I get the same message when I insert my MS Windows xp Home Edition CD as the boot disk.