Missing system file drives in RAID array

On a system with 2 SATA drives in a RAID 0 array, the system will not boot reporting a missing or corrupt file. ( \System32\hal.dll )
In an attempt to repair,(setup repair option) the machine reports that there are no drives to search for a present windows installation. It doesn’t see the raid array.
There is a ton of very valuable information that would be damaging to this company if lost. ( No backup)
Is there a way to save this information?
Can I install an E-IDE drive and put an OS on it and be able to read the SATA RAIDed drives, or just reload the OS without formatting, creating an OS that does work and can use/read the existing non-OS files?