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How to completely remove Ubuntu?

I installed Ubuntu to see what it is.. well I saw and its far to complicated and annoying to me.. or maybe I just looked at it wrong I m still open for ideas..

but I tried to install w7 and when I got to choose the Partition select it says that it can install w7 only on NTFS disc and I have some other type.. what is it and how can I change it?

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marked as duplicate by fossfreedom Apr 8 '12 at 19:58

This question was marked as an exact duplicate of an existing question.

It's really off topic for this site, but ok. The windows installer has the ability to delete filesystems. I don't remember exactly how, though. I'd guess you see something like "Unknown" with a certain size. That's likely Ubuntus filesystem. Delete it, create a new one and install.

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