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This question already has an answer here:

I had windows 7 in C drive and windows 8.1 in D drive. But I installed Ubuntu 13.10 and the system got formatted. I wanted to have 3 OS. But lost the other two. I didnt make any partitions.Now I want to uninstall Ubuntu and install windows 8.1, How to do it?> P.S : I dont know much about partioning.

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marked as duplicate by Avinash Raj, Rinzwind, karel, Warren Hill, falconer Jan 10 '14 at 13:21

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Plus this is not an Ubuntu problem: you need to do this from the Windows installation media. – Rinzwind Jan 10 '14 at 11:13

If you have Windows-8.1 installation disc with you format the ubuntu partition using ntfs with it.

After that install windows-8 on that partition. May be if you can clarify me more like

1.Which drive got formatted.

2.Installed via WUBI installer or direct etc

Then I can help you more

Also if u need 3 OS then you need to have 3 partitions in your hard-drive Every partition for separate OS.

If you don't Want to do it then It can also be done in 2 partitions Install Ubuntu Inside windows via WUBI installer.

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