There are many reports on the “Cannot copy files required for installation error” (with error code 0x80070017). There are many reasons:
1. When you burn the ISO image to a DVD, you need to choose the lowest speed and verify it after burn.
2. Do a memory test. You can get a tool from
http://www.memtest.org/
Any errors reported need to be ironed out.
3. Reload your BIOS settings to default and make sure you are not aggresive to overclock your system.
Compared to Linux or XP, Windows 7 is very poor in terms of overclocking. We had a over-locked system running Linux for a couple of years but Windows 7 freezes from time to time so we have to undone the overclocking.
You can also disable things you do not need (such as onbard wifi for a desktop, firewire etc..)