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Here are the instructions:

Create a backup image of the Windows 7 partition and the System Reserved partition. This is just a general recommendation before making partitioning changes.

Boot into Windows 7.

Start an Administrator Command Prompt and run the following commands to

fix the BCD file:

bcdedit /set {current} device partition=E:
bcdedit /set {current} osdevice partition=E:
bcdedit /set {bootmgr} device partition=E:
bcdedit /set {memdiag} device partition=E:

Copy the Windows 7 booting files to the Windows 7 partition by running the following commands:

reg unload HKLMBCD00000000
robocopy F: E: bootmgr
robocopy F:Boot E:Boot /s

Start Disk Management and make the Windows 7 partition Active partition (this would be the E: partition).

Restart the computer and enter the BIOS. Make sure the Windows 7 drive (Disk 0) is set as the booting drive.

Boot into Windows 7.

Start Disk Management and make sure the Windows 7 partition is showing that it’s the System partition.

If everything looks okay, you can now delete the System Reserved partition. This can be done using DD or Disk Management.