Installing Windows 8.1 Pro by replacing Windows XP
I have dual booting on my computer with Windows XP SP3 in C drive and Windows 7 Ultimate on D drive......... I want to replace Windows XP with Windows 8.1 Pro...... I have the required ISO file for the latter. Give me detailed instruction on how to install the same from a bootable USB drive
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More aboutinstalling windows pro replacing windows
Read this. It is detailed instructions. I know that it's a bit different when upgrading from XP, so you'll need to read all of this.