The laptop came with pre-installed Windows 8.1 x64 (Lenovo 100-14IBY, 2GB RAM, Intel N2840 CPU) and I wanted to install Windows 7 x64 Ultimate so I could enter it to a domain. I made a bootable usb with Win7 and reached the partition section on the installation wizard.
I deleted all the partitions that the system already had (Recovery. MSR and others) and procceded with the installation...
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