Windows 7 install fails on ATC-105-EF30

My father recently took this model which comes with Windows8 but he absolutely hates, so he asked me to put windows 7 on his machine, I've done a million times before.

After starting windows 7 computer hangs upward at the Windows startup screen. I tried even to bury a copy of my legitimate Win7 CD to see if it was the problem and no luck. I tried to remove the ram and even tried another CD. I am at a loss about why this won't work.

To compound issues that I even wiped all the partitions on the disk so recovery I can't even install windows 8 more.

Thank you

In the BIOS:
Set a supervisor password.
Disable secure boot.
Move from UEFI to Legacy and save.
Now enter the BIOS again and clear the supervisor password.
For details, search the Forum. All the info you need is here.

Tags: Acer Desktops

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