As long as both hard drives are running, you have access to the data on the RAID 0.
Copy the data from that RAID, then delete the volume. Create a new volume as a RAID 1, and restore the data to it.
Thnaks for the reply but as a senior with limited computer experience I am concerned if I delete the volume as you suggest I wont have an operating system to continue. I do have an external drive big enough to back it all up but wont I loose my windows 7 once I delete the Raid disk and volume that has the primary partition on it????