To activate Windows 7 on PCs with UEFI, we have 4 available options: Search for a SLIC modded bios in this thread. Any SLIC 2.x modded bios is fine, but SLIC 2.1 is preferable. If you can't locate a modded bios for your model, ask here. After flashing the SLIC modded bios, use Windows Loader by @Daz or manually install the appropriate certificate & the OEM:SLP key to be activated. Use WindSLIC; it acts exactly like Daz's loader, but requires some prior knowledge from users. EzWindSLIC, a user-friendly wrapper around WindSLIC, can also be used. Install/upgrade/downgrade to Professional or Enterprise SKU & activate using any KMS emulator like KMS_VL_ALL by @abbodi1406. In some rare cases, a SLIC modded bios is necessary to support KMS activation. Turn on CSM/Legacy booting in your UEFI firmware settings & format your HDD in MBR style. Then install Windows & activate by Windows Loader by Daz. Refer to your motherboard manual & the enclosed readme of Windows Loader. For activation solution comparison & SKU support, please read this thread carefully. Please post a MGADIAG report & RW-Everything report when asking for any guidance.