New build won't take 64 bit Windows 7

headhuntersix

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Feb 7, 2012
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18,510
So I have no idea what to do here. I installed Vista first (to an SSD) because my 7 disks are only upgrades. In fact, I installed 32 bit vista because the computer just sits there at a black screen when I try the 64 bit vista disk. From 32 bit vista, I can go to 32 bit 7 no problem. Trying to go from 32 bit anything to 64 bit anything, I get

Windows cannot be installed to this disk. The selected disk has an MRB partitiontable. On EFI ystem, Windows can only be installed to GPT disks.

so...WTF?

1. I need another license for 7, since my laptop has 8, and I hate it (plus, I took it to china, so I'm replacing the hard drive as the ultimate means of getting rid of all the malware the PLA no doubt loaded me up with, so two birds, one stone!). The laptop only has 4G, so 32 bit 7 wouldn't be the end of the world. Will a fresh install direct to 64 bit 7, as opposed to an upgrade from 32 bit, get around the error message above? If so, I can just do the vista to 7 dance on the laptop with the licenses I already have...

2. Why does my SSD have a partition? Is it safe to format the drive and delete it? Would that solve the problem? How do I do that when it has my OS on it? I vaguely remember doing that years ago...or was it decades? Might've been on the DX4-100...mabe not that long ago.
 
Solution
You can install a MBR device in a UEFI bios but I should have mentioned that, the newer motherboards have two boot choices for each device, legacy bios and UEFI, and you cannot use the UEFI for the MBR HDD/SSD or optical drive. You have to correctly set your bios entries.

RealBeast

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Moderator
From the 32 bit version of Vista you can do a clean custom install to Windows 7 x64. You will lose all data do that so back up first. You cannot however convert from a 32 to 64 bit upgrade as simply as you can from say Vista 32 to 7 32 bit, as they are incompatible for the simple upgrade process.

You do NOT have to install Windows 7 x64 to a GPT partitioned drive on a UEFI bios, an MBR partitioned drive will work fine (of course it must be smaller than 2.2TB).

In disk management what size is that partition, does it have a drive letter, or are you just referring to the system reserved partition of 100MB?
 

headhuntersix

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Feb 7, 2012
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Yep, I figured out the custom, as opposed to upgrade, thing, for going from 32 to 64.

On the second paragraph, you are flatly contradicting the error message...and since you are not inside my computer,and it simply will not let me do a UEFI install of 7/64 to a MRB partitioned drive, the error message has you beat.

It's the C drive, it's 238GB (A 256GB Samsung 840 pro).

By the way...I figured it out. It was my failure to understand what my mobo was up to. When it prompted me to press the "any" key to boot from CD/DVD, it was defaulting to a UEFI install, which it would not allow on a MRB drive. All I had to do was wait a few seconds, and the prompt refreshed in a different font in a slightly different spot. That was my cue that it was skipping to the second option, a BIOS install, which it would allow on an MRB drive.

 

RealBeast

Titan
Moderator
You can install a MBR device in a UEFI bios but I should have mentioned that, the newer motherboards have two boot choices for each device, legacy bios and UEFI, and you cannot use the UEFI for the MBR HDD/SSD or optical drive. You have to correctly set your bios entries.
 
Solution