I am using Acer Aspire 4736 laptop with windows 8 OS. For a period of few months i am trying to change my OS to windows 7 but my current operating system prevents booting any different OS installation CD other than windows 8. I came to know about UEFI after reading your thread. so i checked whether "secure boot option is enabled in my pc".
From the result i came to know my PC does not support Secure Boot or is a BIOS (non-UEFI) PC. In this situation how can i change my OS.
P.S: I tried to find a way to disable the security boot in BIOS setting but i cant able to find it anywhere.