Hi marils,
They may have enabled the built-in Administrator account that is not the same as the one you set up while installing Vista. I would
not recommend deleting this account though it can be easily hidden once again.
Deleting that account will leave you with no way to repair your computer if something should ever happen to your only default administrator account that you had set up during the installation of Vista.
If you have your UAC (User Account Control) turned off, please go to Control Panel > User Accounts and turn it back on. This needs to be accomplished with an elevated command.
If you have never turned it off, please proceed as directed:
Reboot your computer and make sure that you are logged into
YOUR Administrators account that you created when Vista was installed.
Go to Start > All Programs > Accessories > and right click on Command Prompt and choose
Run as Administrator from the list. Click
Continue in the
User Account Control window that pops up. In the Command Prompt window type (or copy and paste) the following command and press your
Enter key:
net user administrator /active:noYou will get the message,
The command completed successfully. If not, try it again.
Reboot your computer once you see the message and you should only see your Account once again. If you have any trouble let me know and I'd be more then happy to guide you further.
Donna