Installing windows 8.1 with uefi

Dulan Gallege

Reputable
Oct 10, 2014
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I have windows 7 already installed.my hard disk have 3 partitions and there are data in them.so,if i want to install windows 8.1 using uefi do I need to format all my partitions or only the windows 7 installed partition?

please help and provide a step by step tutorial

thanks!