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P35K, can not boot as UEFI OS after Windows 7 installation

MaHa

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P35K, can not boot as UEFI OS after Windows 7 installation
« on: February 17, 2014, 02:48:11 pm »
Greetings

I boutht a P35K with pre-installed Windows 8 two weeks ago.
Now I wanted to install Windows 7.
First I deactivated secure boot, inserted the Windows 7 64 bit SP 1 DVD and restated the system.
The "press any key... " message appeared and I have done so.
After the "Windows is loading files" progress bar completed the message "starting windows" appeared and the setup freezed.
So I changed the OS type from UEFI OS to legacy OS, rebooted and selected UEFI: ODD
Now I was able to install Windows 7 without problems (GPT formatted).
But every time I select UEFI OS as OS type in UEFI Windows 7 freezes at startup.

What am I doing wrong?