One thing I do pretty frequently is add and delete user accounts and going through the GUI can be time consuming especially if your dealing with a slow or unresponsive computer. So, what I opt for is using Windows Command line.
Open a Command Prompt as an Administrator.
First, let's add a user. When you see the blinking cursor, type the follow command:
net user exampleuser examplepassword /add
Your Command Prompt should now look like this.
*NOTE: If you just type net user the prompt will display a list of all the accounts on the computer. This is a fast easy way to get a snap shot of all the users without having to go through the control panel.
If you want to add that user to a particular group you would type:
net localgroup examplegroup exampleuser /add
Here we added the user to the Administrators group.
Now to delete a user:
net user exampleuser /del
You can also add a User Group similar to how you added a user by typing:
net localgroup examplegroup /add
And delete a user group:
net localgroup examplegroup /del
These commands only apply to local user accounts, however, if you are connected to a domain you can add and delete users by adding /domain at the end.
net user Admin2 pa$$w0rd /add /domain
net user Admin2 pa$$w0rd /del /domain
Remember if your stuck on any command you can type /? or help after the command, press enter, and windows will show you how to user it.