Hello. First of all i would like apologise for my english skills. Second i want to now how to recognise EFI "bios" in acer notebooks? I spent one week reading many topics and i didn't find any answer. Only ways to see whether windows is installed in bios or uefi mode. But. There is always talking about uefi mode, switching boot mode and secure boot. Both options are absent in my Bios. I sent technical question to acer, why my manufactured in 2012 notebook hadn't uefi. They said it was preinstalled linux or windows 7 so producer didn't implement UEFI Bios. I also read that insyde H2O bioses are EFI. So the question is how to check it? Because, maybe, my "bios" isn't even EFI and it's really just old BIOS. And finally main question. If it's EFI, so can i reinstall windows 7 using gpt partitions and make it somehow efi mode? I asked because i received notification (as many people) of free upgrade to windows 10 and don't how this installation will treat my MBR HDD (of course i will make a backup of entire hdd) . I called to microsoft, my country departament and they did't answer, maybe question was to difficult, they don't know. If it possible i would like make it GPT before upgrading to Win10. I found many topics how to install windows 7 in uefi mode but i didn't find it clear whether it's only for UEFI based mobo or for EFI "bioses" too. Thank You for any assiastance.