The only machine I have had trouble installing it on is an HP Pavilion a 810n.
It locks this computer down everytime I install it. It will not boot past basic startup and then goes right back to trying to boot all over again.The first time I was able to uninstall it in safe mode but it still wouldn't boot up after uninstall.
So I ran a system recovery and went back to running fine.
Dummy me tried it one more time and it did the same thing again but this time it wouldn't let me uninstall it in safe mode.
So I did a system recovery again and it is back up and running fine again.
But on this machine I will not try SP3 until I find some answers to why it will not take it.
Thanks,