Hi everybody! I'm new to UEFI. I have some questions about UEFI and using secure boot. I have a new - UEFI support - laptop (without op. system) and would like to clean install win 8.1 in GPT partition format and using secure boot (because of it's advantages). 1. When do I need to enable secure boot in the UEFI BIOS? Before installing win 8.1 or after win 8.1 is succesfully installed and/or all device drivers installed? 2. Are there any differences in the settings of secure boot if the install media is DVD or pendrive (pendrive properly created for uefi boot, fat32 file system, etc.)? 3. After win 8.1 is installed is it possible to enable or disable secure boot at any time when needed (for instance use other op. systems to boot from pendrive, etc.)? Thanks in advance