I used the Microsoft tool to create a bootable USB drive with Windows 7 Utimate (64-bit). When I booted from the USB drive and tried to install Windows 7, it asks for drivers or something and will not allow me to continue the installation. I've Googled and found that there are issues with USB 3.0, but my laptop only has USB 3.0 slots and no USB 2.0 slots. I also do not have a CD/DVD drive (my laptop is a Sony VAIO Z, the last model they produced). What else can I try?