Is there a way to uninstall my 3 Linux OS's: Ubuntu, Linux Mint and Pear OS (Pear OS's Partition somehow got formatted, just the partition, not the OS) With GRUB so I can install everything freshly? I made a big mess and I think that I need to reinstall it freshly, I got a Linux Mint live USB in case of emergency.
The real problem is that I also got Windows 8 and I don't wanna lose any files there.
Summary: How do I completely delete My Linux Operative Systems along with GRUB to reinstall it freshly?