Win7 install on EFI system & GPI disks

Something may have got corrupted or possibly a bios setting changed. Some gigabyte boards allow you to switch UEFI (hybrid EUFI) on and off. If the drive truly does have an MBR, then UEFI must be turned off in the bios. If EUFI is enabled you should be able to use GPT boot disks in Win7.

I found the problem. Perhaps even a bug in Win7. I was trying to install Win7 from a BluRay burner. This has UEFI file system or so I assume since it had this label on it in the bios setup from ASUS. Of course the Win7 DVD is not UEFI, but the drive uses this kind of file system and Win7 sees that. Win7 then assumed that ALL disks had the same file system. When I installed from a normal DVD R I had no problems.

In the boot manger in the bios do you see two options for your dvd drive one with the drive model name and one with "UEFI" preceding the drive name ???

I agree with Quanta23 - this is a bug in Win7 install process. Thanks to Hawkeye22 for the tip - I had in fact changed the boot priority on my system between installing Win7 and WinXP on the same machine. Thought I changed it back the same, but as he noted, there were two options on my Gigabyte GA-Z77X-D3H and I picked the UEFI option.

However, the Gigabyte BIOS actually had the DVD burner listed twice in the boot process, first as UEFI, then again as 'P4'. This explains the fact that the 'press any key to boot from CD/DVD' message appeared twice - first in a newer font (that looked like the BIOS's font), then again in the familiar font.

If I pressed any key during the first message, my repair/install choices under the Win7 installed failed with the GPT/MBR message.

If I waited until the second 'press any key' in the familiar font appeared, then my repair worked and Win7 rebuilt its boot loader that the WinXP install wiped out. Saved me hours of rebuilding Win7, not to mention that I couldn't re-install anyway because of the same message.

Yes, this is clearly a Win7 installer bug.

BTW, I only get the UEFI/P4 choice in BIOS for the drive WHEN THE INSTALL DISC IS IN THE DRIVE. When there is no disc there, I only can choose the P4 option. This seems like a BIOS bug to me.

What youre experiencing is NOT a bug. Rather we're in the middle of the industry's transition from the old BIOS system that were familiar with to a newer, more capable in/out system called UEFI. Since the changeover cant happen instantly because of 'legacy' hardware thats still perfecly good and usable, manufacturer's have given us the option to use either.

Your 'bug': Windows 7 x64 allows us to boot directly into EFI mode if there is hardware support and you will see additional devices appearing on your boot priority with 'EFI' preceeding the deivce name. Choosing to boot with such a device will allow you to use the new EFI which is why youre seeing 2 separate messages when bootign from your setup DVD: The first, with EFI prefix and possibly the one with the 'newer' font is the EFI mode installer and the second would use your familiar BIOS an traditional MBR (Master Boot Record) formatted discs. EFI must use GPT formatted hard drives to function and the two are NOT interchangeable. EFI does have future-proofing advantages in terms of disk size support and a much more robust pre-OS environment.

So what is the solution to that?

i've got this problem too, but i wanted to re-install win7 because i had a virus. earlier i re-installed win7 the exact same way (for another reason, like a half year ago) and i never had this problem before. could the virus have done something that changed the partitions into MBR while my brand new pc (just 7 months young) only runs GPT. so that way i have to buy a new HDD because my HDD is broken?

hopefully someone can help me.