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How to completely delete a Windows 7 installation ?

How to completely delete a Windows 7 installation ?
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This is my issue:

- I already installed Windows 7 Ultimate 64bit to partition C: and most of my important software in partition E: (this is the main).

- Then I install another Windows 7 Ultimate 32bit to partition E: (this is the sub).

- After a period of time, I want to remove the 32bit OS in E: partition. But I want to keep the software of 64bit OS already installed in E:, too.

I have tried many way (delete all the Windows, Program Files.etc.of OS 32bit in E:, even try to delete the hidden system file of this OS) but when I start the Windows, there is still 2option of Windows appear to choose => and I want to remove this step.

Somebody tell me to format the E: partition but this is a very bad choice because tons of my software here are purchased for 1-time-key installing.
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