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Windows 7: Upgrade installed Win 7 64 bit to UEFI?

21 May 2013   #1

windows 7 64 bit Home Premium
Upgrade installed Win 7 64 bit to UEFI?

Is it possible to "upgrade" Win 7 64 bit to using UEIF? I have a Asus mob that can run UEFI installations of Windows. I have recently purchase a new Win 7 64 bit CD. I would like NOT to do a new clean install just switch to UEFI. Thanks for any input.

My System SpecsSystem Spec
21 May 2013   #2

64-bit Windows 10 Pro

Hello JM, and welcome to Seven Forums.

Unfortunately, you would only be able to do a clean install to use UEFI since during the UEFI installation it would convert the disk to GPT instead of MBR.

UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with
My System SpecsSystem Spec
21 May 2013   #3
Microsoft MVP


In addition you can reinstall in UEFI mode using the existing Win7 license. It isn't necessary to buy a new copy, which you can use elsewhere.

If you need an installer for your licensed version its provided in Clean Reinstall - Factory OEM Windows 7 which steps will also help you get a perfect install even for retail.
My System SpecsSystem Spec

22 May 2013   #4

Microsoft Community Contributor Award Recipient


If you have Windows 7 installed, & two HDD's, you can clone Legacy to UEFI.
Migrate BIOS x64 install to UEFI.
My System SpecsSystem Spec

 Upgrade installed Win 7 64 bit to UEFI?

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