Do first backup (if this works) what you can by doing the following and at no point use reset disk to non-raid.
In the BIOS set SATA to SATA/IDE mode.
Install an OS like XP on another disk (be sure not to install on the RAID disks).
Install Freeware Raid Reader their maybe two copies of your array use properties to find which one is recoverable and open that one and backup what you can.
This next bit may or may not work to set the array to degraded.
In the BIOS set SATA back to RAID mode.
Reinstall an OS like XP with (I suggest) 8.8 drivers on another disk (be sure not to install on the RAID disks).
Install MSM 8.8 and open in advanced mode
If one disk has an X by it right click on it and reset disk to non-raid
when you reboot the array may be degraded.