Micro_Mag
I don't have much information to work with but the Intel ICH10R will support two separate Raid arrays.......you could try and get the OS/drive (raid or not) up and running then add the raid 5 second.........this does work as Ive done it several times in the past.
Either way....keep in touch with the result.......too many people have these problems, ....fix them ....and we never hear from them again........would be nice to know how you got there in the end so other members can benefit form your hard won knowledge.
Aussie Allan