Can't Delete User; now have two Admins!

I've switched my Admin status to my main user ID but now I can't delete the "User" that I was using as Admin. I've been trying to change the status of my original Admin user name but now I've got two users listed as Administrators and the one I don't want cannot be changed apparently. This is the one I'm trying to delete. Seems like big mess here. Have I confused you? Thanks for help.

Thanks Shawn, I've changed this back and forth enough so far that now I can't tell if it is the Admin account or not. Is there a test or way to find out? I've designated the account I think is the built-in elevated Admin account to the Admin status on my machine but I'm just not sure about the other one. How can I find out? Again, many thanks.

You can go to the command prompt (Start > type in CMD.EXE) and enter in
NET USER
This will show you all of the available users on the computer. Then, you can type in
NET USER *username*
for each of the users you see. In the Comment line, you'll see the one that says "Built-in account for administering the computer/domain" indicating which one is the built-in one.

the default admin is the one listed with the name 'administrator'. other users can be added and assigned the role of administrator, but they will have unique names, usually the name of the user. to find out, you can go to control panel-administrative tools-computer management. then from local users and groups, click on the groups. on the right pane you'll see all groups in the PC. see who's inside the group "administrators". if you see other names than the default 'administrator', these are the ones that can be deleted.
now, you cannot delete one user because right now you are still using the pc as this user. so you need to access windows using the default 'administrator', then delete other users from here.

It is not recommended that the "Administrator" built in account be used for general use. It is best to create an account with administrative rights for your own use and reserve the Administrator account for emergencies. This way if your accounts profile becomes corrupt you can still log in to correct the problem. Otherwise you have a serious problem.

Think Tank said:

You can go to the command prompt (Start > type in CMD.EXE) and enter in
NET USER
This will show you all of the available users on the computer. Then, you can type in
NET USER *username*
for each of the users you see. In the Comment line, you'll see the one that says "Built-in account for administering the computer/domain" indicating which one is the built-in one.

I followed this procedure and found two suprising things:

1. The user name I wish to delete did not come up from the cmd.exe above but my current good one did.

2. A totally unexpected "user" name came up "neromediahomeuser.4" which is really off the wall for me!

So I'm left with two questions to resolve the above: How to delete the user that did not show up and how to delete that Nero "user" which I"ve never used or even tinkered with.

Thanks for all the advice above folks!