Sorry its long but here's your solution.
You cannot access your OS due to the missing file: nvcchflt.sys because this is required for the RAID system to access your drive(s) within Windows. The file should be located within the system32/drivers folder. Deletion can occure when removing VIDEO, and other NVIDIA drivers from Add/Remove Programs.
Without a slipstreamed OS disk, you will be unable to access the recovery console. To create a slipstreamed OS disk, you will need the lates VISTA NVIDIA drivers download from NVIDIA (yes XP users will need this file too! /confirmed to work!)
Download NLITE to create the disk (slipstream) of the LEGACY FOLDER ONLY in the NVIDIA driver pack. google nlite and the vista drivers for NVIDIA.
After extracting the LEGACY folder from the NVIDIA driver zip file, place it on your desktop. You will need access to a working PC to do this of course. NLITE directions to slipstream the drivers is readily available online.
After slipstream you can now access the recovery console within Windows XP setup from the installation boot disk.
The NVCCHFLT.SYS file is STILL on your computer, just not where it supposed to be. Trying to find this file is a real pain in the back end as it is not readily available ANYWHERE online or in the NVIDIA driver packs. I have looked! it is STILL located in your C:\WINDOWS\NLDRV\001 folder. it needs to be in the C:\Windows\system32\drivers folder.
After accessing the recovery console, you can extract the file from the ("backup") folder, into the system32/drivers folder. copy c:\windows\nldrv\001\nvcchflt.sys c:\windows\system32\ drivers
The easiest way to copy the file, and get your system back up and running if this is too much for you, is to reinstall windows on a new disk. The slipstreamed copy of Windows is helpful here, as you will not need to install the drivers for your RAID with a floppy disk. This assumes you are installing another raid to access the raid you already have.
As long as you re-install windows on a NEW disk, and not delete/format your current raid...you will still be able to get your system up and running without ANY loss of data. After installation of the OS, you will want to install the windows drivers for your raid. It should be recognized and installed by your motherboard driver disk.
You then simply open the folder mentioned earlier (WINDOWS\NLDRV) * you may just search the now accessible raid array for the file nvcchflt.sys alternatively* and copy and paste it into the System32\DRIVERS folder.
remove your "temporary" installed OS disk, and your computer will now be working on your previously "damaged" OS RAID array
All of this assumes you do NOT want to reinstall windows and want to LOSE all of your data. In that case, just format and reinstall away! You can use this (new disk install) method to access your array to copy all of your data files as well AND still keep the new os too.