How do I repair a Windows 7 partition when it is after Windows 8 partition in a Dual Boot Setup

I have a laptop that I purchased a year ago and which came pre-installed with Windows 8.
Recently, I successfully added Windows 7 as a dual-boot, and this worked OK. To obtain the space for Windows 7, I shrunk the Windows 8 partition.
In Disk Management, the Windows 8 partition is physically located after OEM and EFI partitions; Windows 7 partition is is adjacent to Windows 8.
All went well until I shrunk the Windows 8 partition further to increase the size of the Windows 7 partition, after which Windows 7 came up with a boot error....Windows 8 still boots OK.
I inserted my Windows 7 disk to perform a Startup/Repair, which failed because the first OS partition it sees is Windows 8 and a message tells me that I need to install the correct media for that system.
I searched for advice and assistance to solve the no avail - and had to completely re-install Windows 7 and the associated applications.....and I really don't want to have to go through this again.
I actually use Windows 7 more than 8, and if I have to lose one or the other, I would dump Windows 8. there a manageable way I can keep the two systems recoverable and migrateable to another disk in the future. If not, how do I safely remove  the Windows 8 partition without damaging Windows 7? Ideally, I would just like to swap the partitions
round....but with EFI and BCD partitions, I am reluctant to go into the unknown.
Sorry....bit of a saga....but would appreciate any advice.
Rob Nick

Hi Rob,
Above all, as the purpose is to enlarge Windows 7 partition, please understand that shrink Windows 8 partition again cannot help on it. A partition can be expanded only if there is free space "after" it.
So you will still need to delete Windows 7 partition for expanding purpose. 
If it is fine to just make Windows 7 back to boot order. Please try following command lines. 
Note: Please run CMD in Administrator mode.
bcdedit /export “c:\boot”
This is a backup. You can delete it if things go successfully.
Then please create a new entry for Windows 7:
bcdedit /copy {current} /d “Windows 7”
It will provide an entry ID. Copy it and it will be used in following 2 command lines.
bcdedit /set {identifier} device partition=X
Replace X with the drive letter of Windows 7 system located.
bcdedit /displayorder {identifier} /addlast
Please remember to mark the replies as answers if they help and un-mark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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