Hi,
- First thing to do is check with Acer and see if they supply Windows 7 Drivers for that Model.
If they don't Windows 7 will not install or work correctly.
- You have no free downgrade rights from Windows 8 to 7; only 8 Pro has that.
- Microsoft no longer sells Windows 7; try Amazon.com., etc.
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To reinstall/create disk for 8 if you have problems with it:
"Use Acer eRecovery application to restore your system or create recovery media"
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Or download the Windows 8.1 ISO and make your own installation Media and clean install 8.1, as support for Windows 8 stopped this week.
"Create installation media for Windows 8.1"
http://windows.microsoft.com/en-us/windows-8/create-reset-refresh-media
A similar Tutorial which may also assist you
"Create Installation Media for Windows 8.1"
http://winsupersite.com/windows-8/create-installation-media-windows-81
In the first screen of this very simple wizard, you need to choose the following:
Language. English – en-us if you're in the United States.
Edition. Windows 8.1 (Core), Windows 8.1 N, Windows 8.1 Pro, Windows 8.1 Pro N, or Windows 8.1 Single Language.
Architecture. 64-bit (x64 ) or 32-bit (x86).
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"How to Create a Bootable USB or DVD with a Windows 8 or 8.1 ISO"
http://www.eightforums.com/tutorials/2227-create-bootable-usb-dvd-windows-8-iso.html
Warning
This will not work to install Windows 8 or 8.1 for UEFI. For that, see this tutorial below instead.
UEFI Bootable USB Flash Drive - Create in Windows
Cheers.