Acer Aspire laptop from windows 8.1 to 7 install problem

I did buy an Acer laptop with Windows 8.1 installed. I have software which runs only under windows 7 so I need to downgrade the laptop to windows 7. At least I tried but the laptop doen's reboot anymore.

I see 5 partitions:

Schijf 0 Partititie 1: Recovery 600 MB available 306 MB (OEM gereserveerd)

Schijf 0 Partititie 2: ESP 300 MB available 246 MB (Systeem)

Schijf 0 Partititie 3: 128 MB available 306 MB (MSR gereserveerd)

Schijf 0 Partititie 4: 449,6 GB available 306 MB (Primair)

Schijf 0 Partititie 5: Push Button Reset 600 MB beschikbaar 306 MB (OEM gereserveerd)

I removed Partititie 4 and created a new one. Installing windows 7 works but after reboot It stops and I got an error message:

One pager story about recently changed software...with below: file:\windows\system\winload.efi
status: 0xc0000426. The digitale signature of this file can't be checked

Which partition can/should I remove without running into troubel to be able to install windows 7 succecfull?

Thanks for your help!

Gr. Men

Accepted answers

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IronFly

have you set, on BIOS, legacy instead of UEFI and disabled secure boot?

men6

Hi can't change secureboot. Can't get there with my cursor.

I switched to legacy but gor error messages during install of windows. "not able to install windows. selected disk has GPT-partitionstyle.

IronFly

ok, revert to UEFI and follow this guide to install windows 7 under UEFI:

http://www.sevenforums.com/tutorials/186875-uefi-unified-extensible-firmware-interface-install-windows-7-a.html

men6

Hi,

Got some progress but still running into trouble.
Managed to switch off secureboot, install windows 7 and boot without error messages. The problem now is the laptop freezes on "windows starting" same story if i boot in windows safe mode.