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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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How to Do a Custom Installation of Windows 7

This will show you how to do custom installation of Windows 7 to have a new clean install of Windows 7, but with everything from your current Windows installation backed up into the Windows.old folder during this custom installation. After the custom installation, you can copy any files you wanted back from within the C:\Windows.old folder back into your new installation of Windows 7 and delete the Windows.old folder when finished.

Fix a serious Windows 7 problems

In this tutorial, we will take a look at how we can reinstall Windows 7. The type of installation we will be doing here is called an "upgrade install". There are two reasons that you would choose this option, the first is when you want to upgrade from Windows Vista. The second is when you want to repair an existing Windows 7 installation without completely reformatting the hard drive. A better name for this option would be "upgrade/repair".

How do I remove the Windows.old folder?

If you install Windows 7 by performing a custom installation and don't format the partition during the installation process, files that were used in your previous version of Windows are stored in the Windows.old folder. The type of files in this folder depends on your computer. After you've used Windows 7 for a while for example, one or two weeks and youre confident that your files and settings are back to where you want them to be, you can safely reclaim disk space by using Disk Cleanup to delete the Windows.old folder .

Windows installation problems: frequently asked questions

Here are some answers to common questions about installing Windows.
How do I upgrade my computer from Windows XP or Windows Vista to Windows 7? How do I get a product key? How do I make my computer start from the Windows installation disc, rather than the computer's hard disk? What can I try if I get a message saying there is a problem copying files? If I see a blue or black screen or a screen that doesn't change, is my installation broken? How do I install Windows 7 on a netbook? How do I fix a device, like a monitor, sound card, or printer, that doesn't work since I upgraded to Windows 7? Will my programs work with Windows 7? Can I try reinstalling Windows if my computer loses power during installation?

Upgrading from Windows Vista to Windows 7

If you can't upgrade your computer running Windows Vista to Windows 7, you'll need to select the Custom option during Windows 7 installation. A custom installation doesn't preserve your programs, files, or settings. It's sometimes called a "clean" installation for that reason. A custom installation is more complex, and it can sometimes take a couple of hours to complete. We created this five-step tutorial to help guide you through the entire process each step of the way.

Windows 7 installation problem

I was re-installing windows 7 and during the installation my computer turned off. Now when I turn my computer back on it won't let me resume the installation of windows 7. I do not have the windows disc because my computer came with windows 7 on it.

I've tried to use the F8 commands to fix it but nothing seems to work. I am just trying to some how get windows files that are still on my computer to work and let me re-install it.

Winodws 7 install

When trying to install windows 7 from an iso mounted on my pc, I click custom installation and the connect to the internet options and it starts copying files and after about 30% it jumps to 100% and says:
Windows cannot copy files required for installation. The files may be corrupt or missing. Make sure all files required for installation are available, and restart the installation.


Start Windows from a CD or DVD

You might need to start Windows from the installation CD or DVD if:
You want to install or reinstall Windows. You want to recover Windows from a serious error. If your computer won't start Windows at all, you can access system recovery options from the Windows installation disc that can help you get Windows running again.

Problem installing programs

Last week I bought my new computer and installed Win 7 Professional 64bit. Everything seemed to work fine, but some installations (which worked on my laptop with Win XP) cancelled with strange errors. I thought this was due to my 64 bit installation of Windows 7, so I reinstalled Windows with a 32 bit version. (If someone asks if they are legal versions: yes they are). But the installation problems were still there.
It seems as if my Windows installation says some .cab files which I try to install are corrupted.

Upgrading From Windows XP to Windows 7

According to this article:
someone who has Windows XP installed should be able to purchase the Upgrade Version of Windows 7. (Of course, all other software would have to be re-installed.)

Clicking on the link "Upgrading From Windows XP to Windows 7 (Custom Installation)" actually takes me to an article that deals with "Upgrading From Windows Vista to Windows 7 (Custom Installation)".

I called Microsoft's Personal Support team (at 800-936-5700) and they told me that if I want to switch from Windows XP (SP3) to Windows 7, I would need to purchase the Full Retail Version of Windows 7.

So: Can I, or can I not, purchase the Upgrade Version of Windows 7 if I currently have a legit copy Windows XP (SP3) installed? (PS: I am fully aware that when switching from Windows XP toWindows 7 requires re-installation of all the other software!)