This message was posted on behalf of Intel Corporation
I understand something went wrong while updating the operating system, since this was a bootable RAID 5 status as verify, there is no way at this point to run verify and repair through Windows®, because some of the boot files are corrupted or damaged.
This is a Windows® issue, not a RAID problem because you mentioned that you tried to repair the operating system and gets stuck in a loop.
As a recommendation, you would need to reinstall the operating system and recreate the array.
I had a suggestion to install the os on a new hd in this pc, then see if the damaged raid was readable. Does this sound feasible?