I have an Acer ZC-606 that came with Windows 8. I have followed all the suggestions including a full security wipe and reformat of the HDD. Boots from Windows 7 install CD and from a USB install drive, BUT, it then freezes a couple of minutes into the install. It stops at a slightly different place depending on the install media, but neither one works for more that 2-3 minutes.
Acer says if you touch the operating system it voids the warranty and hence they are of no help at all. Anything else in the bios settings that could possibly mess up a Windows 7 installation?