Dual boot Win7 and Win8.1 SysPrep with UEFI GPT Problem

[allgames71]

I've create 2 partitions, 1st partition is Win7 SysPrep and the 2nd partition is Win8.1 Sysprep
I install Win7 and press Ctrl-Shift-F3 to form SysPrep, same as Win8.1 in 2nd partition.
I made this becuase I've 25 Dell new Win8.1 Computer which are UEFI. So I want to make a master computer which has both Win7 and Win8.1 with SysPrep in it. Then I want to clone it to the other 24 Dell computers.
CASE 1 : 2 different partitions with 2 different Windows :
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If I install both Windows like above, when Sysprep Generalize Win7, it works fine. But if I SysPrep Generalize Win8.1, it's fine also, but never can boot again back to Win7. The start boot option is like this :
Windows 7
Windows 8.1
If I choose to boot Windows 8.1, it's fine. If I choose to boot Windows 7, it ever boot to Windows 8.1. It means nomatter I choose to boot which Windows, it all goes to Windows 8.1 ?????
CASE 2 : 1 partition for Win7 + Win81.VHD :
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I install Win7 (C and press Ctrl-Shift-F3 to form SysPrep.
I create a Win81.VHD in Drive D: , imagex Win8.1 install.wim in it. Also press Ctrl-Shift-F3 to form SysPrep.
Sysprep Generalize Win7 is OK , SysPrep Generalize Win8.1 is also OK. But after that I can only boot to Windows 7 fine, when choose to boot Win8.1 , it always restart and back to the boot menu ?????
Can anyone help ? Thanks a lot.

 

[caperjack]

hello,you uefi setup issue is a little over my head ,lol ,but
when I setup a simple duel boot with 7&8 I too had same issue and I ran the win8 boot repair and it fixed the mbr [I assume]so I was able to then boot to either os, good luck.
run repair
http://www.eightforums.com/tutorials/2843-automatic-repair-run-windows-8-a.html