I got the error using one SSD to install Windows 7. I bypassed the error message using F12 to boot from DVD burner--one SSD installed--and installed Windows 7 on it. The error message no longer appears, but I can't boot from Windows 7 or Vista disk--goes straight to desktop. I now have 3 SSD installed without any problems, just that boot from CD thing. So, while I have Windows 7 installed on two SSD, I will erase one tomorrow.
I don't know why I got that bootmgr is missing when having just the blank SSD for Windows 7, but that issue is over now.