I have the same pblem, running Vista Home Premium, I am administrator and sole user of the machine.
I registered a copy of Adobe Photoshop Album Starter v. 3.0 online. Adobe sent me the activation code via email, however Vista will not alow me to activate as I do not have administrator priveleges.
Actual message reads:
'Your unlock code was not activated.
Administrator privileges are needed to activate the unlock code on this computer.
Please log in with a privileged account and try again.'
Any ideas would be appreciated.