Privileges problem running under Vista

I posted this question on the EMC Insignia forum, but haven't had any response, so I'm hoping someone here will be able to help!

I've just bought a Western Digital MyBook external drive, which comes with EMC Retrospect 7.5 Express.
I installed the drive as per the instructions (there was an error about 'no driver' under Vista, but the drive is being seen and I can transfer files to and from it).
Then I installed Retrospect and the recently released upgrades to it, which I d/loaded from the EMC site.
But whenever I start the program I get a message telling me that I don't have administrator privileges and any backups might not be complete.
My copy of Vista is a clean install on a brand new drive. I am the only user and am listed as the administrator when I go into the users' settings.
Having searched for a possible solution, I found one suggesting I go into Retrospect's configure/preferences and select 'always run as the specified user'.
I did this, put in the password, and added the name of the PC (which was the PC's name under the system manager and not just the name of the C: drive).
This time I got 'you do not have sufficient privilegs to define the backup user'.

So I tried checking the box in the program's 'compatibility' tab, 'always run as administrator'. This time when I ran the program, I got asked for a username and password, which I entered, and was told that I'm 'not in the administrator's group' and my password didn't correspond to an administrator's account!
I AM the administrator, as I said, so how come I can't run the program?
I've managed to do a backup, but there was a list of files that weren't backed up including the registry.
I'd like to get this working properly, and would appreciate some advice.
EricCartmanAsked:
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Brian PiercePhotographerCommented:
Are you sure you are the 'real' administrator. In a clean install of Vista the real administrator is disabled by default and has no password. See http://technet2.microsoft.com/WindowsVista/en/library/9fe3a3eb-01ec-47d4-abac-227bd6d8490f1033.mspx?mfr=true
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EricCartmanAuthor Commented:
Well, that article helped point me in the right direction - but because I'm running Vista Home Premium, I couldn't access the local users and groups via the console as it suggested.
However, a bit of digging around in the Users settings under control panel ended with me finding the 'turn user account control on or off'.
So I went into this, turned off account control and ran Retrospect without a problem.
So thanks for the advice, since it led to a solution eventually!
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