I want to uninstall my Ubuntu 12.04 (installed using Wubi). My Ubuntu is on one of partitions that I don't want to delete my partition.i using win 7. And I don't use grub
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OP indicated in the comment to one of the answers that it is an WUBI install. – user68186 May 07 '13 at 16:28
3 Answers
To uninstall Ubuntu (if you installed it using Wubi), simply go into Programs and Features from Control Panel in Windows 7, look for Ubuntu and uninstall it, just like you would uninstall any program in Windows (see image below). It will not delete the partition, it will only delete the files that it created on that partition.
If this did not work, or for more information about Wubi uninstallation (or general Wubi information), click here

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from windows7 manually delete home
folder
now, if you have grub as your boot manager its not advisable to delete anything else.
if your boot manager is the windows one you can delete manually the other folders of ubuntu
for future reference: use Gparted
to organize your hard drive before installing any OS so this wont happen again.

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From Win 7 simply format the hard drive.

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With a live cd enter in the partition, save files on a usb drive and then erase the partition from win7. I always do in this way. – sharkbait May 07 '13 at 16:12
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All he wants to do is uninstall Wubi, a simple fix via the Control Panel. He stated in his original question that there were files he wanted to keep, so he didn't want to reformat the entire partition. – RPiAwesomeness May 07 '13 at 17:22
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