Lenovo IdeaPad S300 Notebook - Manual (Page 37)

Chapter 6. Troubleshooting
33
When do I need to change the boot mode?
The default boot mode for your computer is the UEFI mode. If you need to
install legacy Windows operating system (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.
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Getting help
How can I contact the customer support center?
See “Chapter 3. Getting help and service” of Lenovo Safety and General
Information Guide.