RAID10(RAID0+1) Has ONE Non-RAID Disk and Can't Boot?

I'm stumped. Woke up today and my computer wouldn't boot because one of my four disks in RAID10 was marked as an "Offline Member". CTRL-I doens't give me any options to put it online, rebuild, etc.
Read some posts that said to either:
a) Unplug all other drives, and format that drive using a windows setup
b) Mark that disk as Non-RAID

Tried both of those. Vista installed ifne on that one drive. But when I switch the BIOS back to RAID setup instead of IDE, it still says that disk is "Non-RAID" and there's no way for me to get it back?

I don't understand why with 3 working drives I'm dead in the water?

I also read a thread that says to install the Intel Storage Matrix in Vista (after unplugging the other drives) and then using that to rebuild the array. Problem is, I can't even install Storage Matrix because I can't get into Vista w/ a RAID configuration.

I would hate to lose my data, can anyone offer anything else?