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Downgrading is not as simple as upgrading. You will need to reformat and reinstall from your original disc.
I'm running an HP 2000-300, with Windows 7, 64 bit. Originally Home Premium came with the machine. I have installed the Enterprise edition over the Home edition, but I want to go back to the Home edition. Is this possible? And if so, how can it be done?
In this excerpt from Answercast #40, I look at the steps necessary to downgrade to a previous operating system – it's a full reinstall.
Well of course, anything is possible. Unfortunately, I don't don't think you're going like the steps that are going to be required to make this happen.
To begin with, I want you to first backup your existing machine with the Enterprise edition installed. I want to make sure that you don't lose anything in what happens next.
The only way to downgrade from one version of Windows 7 to another (in other words, you're going from a more capable, more expensive, larger version like the Enterprise edition to one of the more basic versions like the Home edition) is to reformat and reinstall the edition from scratch.
So, you're going to actually erase your hard drive – which is why I had you back it up first.
Then grab those Windows 7 Home edition discs;
Boot from the install disc for that;
And reinstall Windows 7 from scratch.
Now at that point, you're also going to want to reinstall all of your applications from scratch. And you're going to want to re-copy over all of your data from your backup, or from wherever you keep it, onto this newly installed copy of Windows 7 Home edition.
Now, if that seems like a little much, well, unfortunately, it probably is. It's what it does take.
In your shoes (I'm not sure what's driving you to make this particular decision to want to revert to the Home edition) but in your shoes, I would be really, really tempted to live with the Enterprise edition instead.
It's not nearly as easy as it was to upgrade; where you might just run an
installation program on your existing version of Windows. This does require a
complete reformat, or at least a complete reinstall of Windows 7 Home
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