How to switch to Legacy BIOS for Win7 install?
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Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=2081
Printed Date: 20 Apr 2024 at 12:24am
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Topic: How to switch to Legacy BIOS for Win7 install?
Posted By: thegreywizard
Subject: How to switch to Legacy BIOS for Win7 install?
Date Posted: 26 Feb 2016 at 1:35pm
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I've having an issue installing Windows 7 64 an a Samsung SSD, getting the BSOD right at the final part of the installation. I was told this could be due to the UEFI vs Legacy BIOS and if I switched back it would probably do a successful install. I do not want Windows 8.1 or 10, only want to install Win7 64 so I can jump to it from time to time for a few various tasks. So how do I easily switch from UEFI to legacy BIOS so I can complete the Win7 install and then switch back to UEFI once install is completed? I'm also running Ubuntu as my main OS on a separate SSD than what Win7 will be installed on.
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Replies:
Posted By: Xaltar
Date Posted: 26 Feb 2016 at 1:54pm
We will need to know what motherboard you are using, the rest of your system specs would be good too  ------------- 
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Posted By: thegreywizard
Date Posted: 27 Feb 2016 at 11:22am
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Duh, sorry about that. X99m Extreme4 16gb ram EVGA 970 GTX i7 5820k Samsung 850 Pro SSDs, Ubuntu 16.04 is on a 128g & hoping to put Win7 on the 256g 1000w EVGA P2 PSU |
Posted By: parsec
Date Posted: 27 Feb 2016 at 12:36pm
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The default UEFI settings, with CSM set to Enabled, and all CSM sub option set to Legacy Only, is all that is needed for a Legacy installation. But again, those are the default UEFI settings, which is 100% legacy mode (yuck!!) sorry It is true that Win 7 will have problems with a UEFI installation, due to a mistake in the location of a file in the folder structure of a Win 7 installation. Anything newer than Win 7 does not have this bug. What are you using as the installation media for Win 7? If it is a USB flash drive or even an optical disk, be sure that in the Boot order you are NOT using an entry that is, "UEFI:"<device name>, where device name is whatever the media you are using is. This is probably the problem you are having. Select the entry that is "AHCI": or "RAID:" if you are using RAID. Don't use IDE, unless you want to cripple your SSD. There is no way, or no need, to switch between a UEFI or legacy BIOS to accomplish what you want to do. I've installed Win 7 in UEFI mode with the file fix needed for Win 7, but again, you only need to select the appropriate entry in the boot order list. NOT the one with the prefix "UEFI:". ------------- http://valid.x86.fr/48rujh" rel="nofollow"> 
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Posted By: thegreywizard
Date Posted: 28 Feb 2016 at 3:14pm
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Ok I'm new to UEFI, so please bear with me, what exactly is CSM and where is it located so I can set it to legacy only for a clean Win7 install? I will be using a real Windows 7 backup install DVD. Where would I set the SSD to ACHI in UEFI?
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Posted By: thegreywizard
Date Posted: 02 Mar 2016 at 3:49am
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Ok so the installed worked fine setting the SSD to SATA instead of UEFI How do I set up a dual boot system now? I have Ubuntu 16.04 on a 128 SSD and Win 7 on a 256 SSD and when I plug them both in it only shows the 256/Win7 SSD in boot manager, but if I unplug it completely it will see the 128/Ubuntu SSD. I know you're normally supposed to install windows first, but I couldn't get it to work so installed Ubuntu first, so I assume Windows overwrote the GRUB like normal, but is there an easy way to set up a dual boot system inside of UEFI once windows takes control of GRUB?
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Posted By: thegreywizard
Date Posted: 06 Mar 2016 at 2:23am
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