Lost administrator rights in Vista business
I previously had set up Vista on my laptop so that both userids had
administrator rights. That's changed (I don't know how because I
certainly didn't do it - Windows auto update I suspect !) and the user
group for both is now "debugger users". When I try to change it back to
administrator I get "access denied".
I've tried starting in safe mode but it won't let me enable the hidden
administrator account. My laptop came only with a recovery DVD and I
don't seem to be able to boot from that without wiping the disk. Clearly
I don't want to do that !
How can I recover my admin privileges please ?