In the section entitled “ Using the Custom installation option without formatting the hard disk”. There is a procedure for reinstalling Windows 7 documented on the following MS Web page: (In other words, I don’t have a multi- or dual-boot system.) I now wish to reinstall 64-bit Windows 7 into the same C: partition, again in UEFI mode. The disk has two primary partitions: a C: partition which contains my Windows 7 system and other installed software such as Office, and a D: partition which contains only personal data. Hopefully this should help you move forwards to Windows 10, yet still deploy Windows 7 for your existing needs.I have a PC with a single hard disk and, a while ago now, I installed 64-bit Windows 7 on it in UEFI mode. So how would this look on various machines? Well, we can go into the BIOS and change the settings We call this “UEFI Hybrid” mode, after the name HP gave this mode (see below). Now, honestly, we have had some problems getting Windows 7 running on a pure “UEFI” implementation, instead we have found out that you must enable * some* legacy aspects of CSM, but not the full CSM mode. The advantage here, is that if/when it becomes necessary to migrate to Windows 10 and leverage the security features of Windows 10, all we need to do is run the standard Windows 10 In-place upgrade task sequence for SCCM/OSD or MDT. – May require CSM “Hybrid Mode” not full BIOS mode. “Install new Computers for Windows 7 in UEFI mode without Secure Boot!” Moving forwards, We are now have a new recommendation: For many IT departments, Getting Windows 7 to load with UEFI is hard, so they load in BIOS mode instead.
Windows 7 does support UEFI, however you may have some more problems getting Windows 7 loading in UEFI, so we may need to add some CSM components, in a “Hybrid Mode” to load. Windows 7 can’t work with UEFI and Secure Boot, because Windows 7 isn’t a supported Secure Boot operating System. This all happens when you get a machine that supports UEFI and Secure Boot (Say a machine with a Windows 8, Windows 8.1 or Windows 10 Logo), and you want to install Windows 7. Stay tuned to 1E for more information this week on BIOS to UEFI. Instead, we will need to perform a wipe and reload on the machine. The big challenge in this space is helping clients and customers who are currently running Windows 7 to upgrade to Windows 10 with Secure Boot, If you rolled the UEFI firmware back to CSM/BIOS mode, then your machine can’t leverage the super cool Windows 10 In-Place Upgrade functionality to upgrade from Windows 7 to Windows 10. We got some exciting stuff going on here at 1E around Windows 10 and security features like Secure Boot and Device Guard, and I’ve have been digging into the details of BIOS and UEFI. I’m here at the Minnesota Management Summit at the Mall of America.
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