So, unless I'm reading wrong, you already had it setup, then used some other software outside the RAID setup to change one of the disks' partition tables and hoped to use that to rebuild the RAID. If you did fully get the one disk working by itself, and did get the RAID rebuilt using the 2nd drive, then you may also be having a driver problem at this point.
From what you're wanting to do, I'd suggest it may be time to just step back, wipe everything clean, and start from scratch. If you can see the data, back it up first of course.
Then...
1. Use the hardware RAID configuration if you used Windows before. Because if you use the Windows RAID configuration, you're going to have an awful time handling that same RAID (if it can be done at all) for multiple operating systems. You may have to enable the hardware RAID from within your BIOS settings.
2. Once that is setup, you'll need to install each OS. I forget the order, but it's best to go from oldest to newest or newest to oldest (not your choice, just one of those works easiest - there are lots of walkthroughs that talk about the hows and whys of it).
3. If you are inexperienced in doing a setup like this, then be sure to do plenty of reading ahead of time, so you're not scratching your head afterward.
4. If you intend to do it again at any time, then it might be a good idea to document everything you did.
5. It may not hurt to consider a 3rd party boot manager. You can use Grub, which is free (Linux). There is also EasyBCD, which I think has free and paid versions. There is also
BootIt NG. The latter costs $30 or $50, I forget, but they also have videos on their site showing you step by step how to install multiple OS on the same system using their boot management software.