Installing Windows from scratch can be more or less of a pain, especially when the Windows 7 USB/DVD tool (so you can create a bootable USB drive with the installer) fails to work.
If you are getting an error “Unable to copy files…” to the USB drive, here’s a quick fix:
First run “diskpart” from a command prompt with admin rights. Then…
select disk # (the number of your USB – make sure this is it!)
clean (this will clear the Master Boot Record)
create partition primary
select partition 1
format quick fs=fat32
Be EXTRA careful about the disk you are selecting. Choose the wrong thing and you could potentially delete a working partition with all your data in it.
This should get you going with the Windows 7 USB/DVD tool (WUDT). If for some reason it still won’t work, you could try an alternative program which is recommended by many (I’ve personally only used it once) called Rufus.