Sentinel45 said:
H Ranger4,

Yes, I am trying to do an upgrade from Vista Home Premium 64 bit, to 7 Home Premium 64 bit from within Vista.

The upgrade runs through faultlessly, but when the PC re-boots, I get a blue screen advising that the upgrade was unsuccessful. The O.S. then reverts back to Vista.
Read through this website, even though it's for the 32 bit upgrade, to be sure that you have done everything needed for a good upgrade.

How To Upgrade from Vista to Windows 7 Home Premium Edition