I am afraid dual booting is a bit more advanced. And UEFI is new so there may be cases where you have to use commands to do things.
But we usually post terminal commands as Linux has many gui's and each is different on how to do things, where the terminal command is the same. Most cases you should just have to copy & paste which does not require really learning the commands any more than clicking on menus.
I still do not understand what you did that Windows had to reinstall. Just plugging drive back in should not have caused that.
My suggestions have always been to have Windows on one drive and fully bootable without any other drive. But you can chainload from grub's menu to boot Windows. That also works with UEFI. And on my system a flash drive is seen as another hard drive to boot, so there is no real difference.
UEFI dual boot two drives
http://ubuntuforums.org/showthread.php?t=2031836
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