The problem is on your RAID5, might be the controller or Intel Rapid Storage. It is not a simple fix and could not download a software from internet, then get it fix. If your data is important, I strongly encourage you send all drives to a professional data recovery company before all chances of recovery are lost.
most likely a driver error. I had some massive and flaky raid 5 issues.. so I migrated to a raid 0+1 solution. Raid 5 had alot of issues with drivers and windows sometimes. In fact one of the intel updates constantly caused my drives to drop out of the array.. its bad when your boot drive raid 0 is dropping drives.... It was an intel ICH9r but I forget what the bad driver version was.
I then Migrated to a raid 0 solution with a 4TB NAS.. chances of both failing at the same time is very slim.
finally I just deleted the raid volume and had to format my 4x 1tb now everything runs good I guess my drives didnt died they just failed badly. no more Raid 5 now will just run those drives standard way
R-Studio can recover your data so long as you make no changes to the drives upon failure. Take the member disk out of the array, then boot the system and run R-studio you can virtualise the array scan the HDD block and view data contained for recovery. I had the exact same issue after a BIOS upgrade took two drives out of a four drive raid5 array with Rapid storage giving the exact same error and status. That was the only way to save my data.