Sony Vaio VGN-FW390 running Win 8 Pro, no external devices, only MS startup processes, tried both MSDN (yesterday) and consumer (today) ISO installs for Win 8.1 x64. Goes through entire, lengthy install process all the way to the end, then encounters an error and proceeds to reinstall my original Win 8 version. Upon rebooting, error window states "We couldn't install Windows 8.1 Preview. We've set up your PC back to the way it was before you started installing Windows 8.1 Preview. 0x101-0x4000D
Any suggestions?
UPDATE 6-28-13: Got it to install. Turned off Win Defender. Selected Save system settings only, not windows settings etc. This did the trick. However, be warned that this not only uninstalls all the Win8 (Metro) apps, but also all your other Desktop apps.