I have the same problem ... I am using bootable USB drive and trying to install on ViewSonic ViewPad 10, currently running Windows 7. Checked the ISO image hash, everything is OK. The installer complains there is no CD/DVD driver available and quits. I cannot really start from within Windows 7, because the tablet only has like 2 gigs free, so the installer says the machine does not meet the requirements. If I boot from USB, it asks for CD/DVD driver. I thought tablets don't need that...