Actually, I'm 100% not sure what you are saying. Hopefully you can at
least log on! If you can, I realized that I didn't explain how to even
find the sysprep tool (it's a dangerous thing to mess with, I'm warning
you!)

If you can at least log in, you'll need to hit [windows key on keyboard]
and the letter "R" at the same time (win+r) or otherwise open the "run"
menu. I don't generally like the new version of the start menu.

type this:

%windir%\system32\sysprep

So... when that folder opens, right click the icon for "sysprep.exe" and
then select the "run as administrator option" ... as I said before,
"audit mode" will be available next time your system boots.

I can't promise you'll manage to exit audit mode without using "oobe"
but since you managed to break the permissions on your main admin
account, it might actually be a good thing to do oobe mode anyway (it
will force you to create a new account with admin rights)

In this case, you had better hope that the OEM / PC builder / store that
installed vista for you in the first place left the admin account in
with a default / blank password (when you reboot, it might just fail to
log into the admin account all together saying "wrong password" if it
has been changed)

Hope this clarifies things