Not sure what issue you having, but I have done a few re-install over the past few days, I messed things up badly, without issues.
When I reboot I left the DVD in and when it booted to it, I choose boot from harddrive and things went through fine, got Avwizard and the Sara. I have a GT430, so in installed the 290 drivers and backport alsa, but not getting sound through HDMI; well no sound at all as the board has no onboard sound.