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#11
Did you try to boot into Windows 7 by selecting it to boot first in BIOS?
When you plugged Vista back in, it booted up so there should be at least two HDD's there for you to choose from.
Try the F10 or other BIOS boot order shortcut key, or just boot into BIOS F1,2 or delete, then select the Win7 drive to boot to see if it will.
You need to boot into Windows 7 in order to run a repair install But the only reason to do this is to have it reconfigure the boot correctly, and there is no way to know it will do this with RAID. So better to settle for booting into either OS by using BIOS boot order method.
If you cannot boot into Win7, then your next step is to boot into the Win7 installer and run Startup Repair at least 3 times to recover your ability to boot Win7. Again, expect RAID complications. But at any point you can again pull the Vista drive and repair Win7 startup to get into it.