Lenovo B70 User Manual page 27

When do I need to change the boot mode?
The default boot mode for your computer is UEFI mode. If you need to
install a legacy Windows operating system (that is, any operating system
before Windows 8) on your computer, you must change the boot mode to
Legacy Support. The legacy Windows operating system cannot be
installed if you don't change the boot mode.
Getting help
How can I contact the customer support center?
See "Chapter 3. Getting help and service" of Lenovo Safety and General
Information Guide.
Chapter 4. Troubleshooting
23