Sarted with Windows B2 running > Inserted DVD > Install Now > Upgrade
B2 product key was valid
Got a warning that AVAST was not compatible - continued anyway
Install seemed to complete normally (about 1 hr), but after the "running Vista for the first time" PC rebooted and went into a reboot loop. Would reboot to "failed to start" and choosing either "Normal" or "Safe Mode" had no effect - still reboot loop.
Unplugging all USB devices had no effect. Booting from the DVD and choosing repair had no effect.
Then booted from DVD and choose "new install" and installed OK. Tried to load AVAST, but received and error that an AVAST driver was incompatible (apparently an error in 5536 according to the AVAST forums).
No other issues after 1day (removed AVAST and using AVG for now)
Thanks for letting us try this release! 