particularly this parts
7. Once you're happy and confident that this newer release is good for you, click on "Install" on the desktop and proceed with a normal installation.
8. When asked by the installer, choose "Specify partitions manually (advanced)", select the partition that you used for your current installation of Linux Mint, assign "/" to it, and reformat it to "ext4".
so i restart Windows 7 and boot to the USB containing Linux Mint 13 and click "Install Linux Mint" on the desktop and when im prompted by "Installation Type" i choose "Something Else" and selected the EXT4 filesystem since that is Linux Mint 12 and click the "Change" button and then set "EXT4" and set "/" for it
and after the installation and reboot Linux Mint 13 i cannot boot into Windows 7 or Linux Mint 13 that is not the USB version it gives me this error
ERROR: Invalid Arch Independent ELF Magic
i googled for this error but nothing helps, and most solutions are for SSD storage device and UEFI bios problems which is not my case, hope someone can solve my problem here, i got a lot of files on my Windows 7 and do not want to lose them