Windows 7 & RAID 10

I am working on a computer that is running Win7, has a Kingston 64GB SSD, and four Seagate HD's in RAID 10 configuration. ASUS P6T SSE motherboard, using onboard RAID Controller. Port 4 has failed, and the owner attempted to change the drive without removing it from the RAID first. Now when I view the control panel (Intel 8.9), it shows port 1, 2, and 3 as part of the RAID, and a disk missing. The SSD and port 4 are showing under Non-RAID drives. When I reboot and go to the RAID configuration page, it shows all the RAID drives, including Port 4 as Non RAID, but it won't let me change Port 4 to RAID drive.

Any suggestions on getting Port 4 back into RAID drive status?
 
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