I posted a thread a while back looking for a windows 8.1 iso file i could download directly to put on my USB for the bootcamp installation. [http: // softicle . com/en_windows_8.1_with_update_x64_dvd_4065090.iso] Someone was kind enough to link me to this, but when i started to transfer it to the usb it said "USB cannot be used, error copying windows files." Now the problem could be with the USB (but i just bought it -_-) or the file could be corrupt in someway. I also went back and downloaded it again and it gave me an error saying "bootcamp can only use 64-bit windows, windows 7 or later." So i honestly don't know what the problem is now. Can anyone link me to a different 8.1 iso? Or solve this problem?