I happen to be one of them that has access to the beta and did a fresh install of v744 with the SP1 intergrated ISO and had no problems with 'activation'....I couldn't update my current installation, due to it being a 'vlited' install with components removed...SP1 presently updates only if you have a full untouched install with no components removed.
What is your BIOS mod configuration? Motherboard Manufacturer and SLIC table.(e.g.: MSI and DELL) Carlos