I installed Linux Mint 17 in the traditional BIOS mode. However, Windows 8.1 on my computer can only boot in the UEFI mode. I do not want to reinstall the Windows or erase it.
How to turn a BIOS-based Linux Mint 17 installation to UEFI booting?
You may refer https://help.ubuntu.com/community/UEFIBooting for some information.