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If you need a fresh start, you can do it with a windows 7 installation media If you don't have one, then use the below links Windows 7 Home Premium x86 - Download Windows 7 Home Premium x64 - Download Windows 7 Professional x86 - Download Windows 7 Professional x64 - Download Windows 7 Ultimate x86 - Download Windows 7 Ultimate x64 - Download All these ...
You can use gparted, a GUI tool to manage partitions or fdisk, a command-line based utility for the same purpose. See manual page of fdisk and manual page of gparted for more.
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