Pay particular attention to Grif's comments about Microsoft listing certain drivers that may cause problems... that is where I would start.
I went with the "run" installation since I didn't see an option to download the program to disk. I did not have the beta edition installed.
The installation went smoothly until I finished installing Service Pack:Stage (2 of 3). At this point, the system rebooted, then went through the "Safe Mode, etc" screen. I first let it do the countdown and then a normal installation. From there it flashed a blue screen about memory problems, etc. The screen was only up for a few second and then my computer basically shut down. The power lights were on, but no disk activity. I let it remain in that state for several minutes hoping the installation would continue.
No such luck. I then cycled the power switch and rapidly booted back up to the "Safe mode" screen. This time I chose safe mode with internet and the Service Pack 1 installation screen popped up reading...
Service Pack: stage 3 of 3 at 37%. I let this run and after many minutes, my computer booted back up to straight Vista with a message about a failed service pack 1 installation. However, I was back in business.
I then made some backups and tried the installation again with exactly the same results OR AT LEAST I HOPE SO since the computer is still running.
I personally had no issues with Vista and IF my computer does finish and put me back into the previous Vista installation, I'll probably quit for now.
I'm at a loss of ideas as my previous Vista installation ran so good. No apparent driver/hardware issues.
Does anyone know if this is a common Service Pack problem getting into the stage 3 of 3 part of the installation?