1. Right Click Start
Right click on Start and then select Computer Management.
2. Expand Local Users and Groups
Expand local users and groups and click on users.
3. New User
Right click in the open space by the other users and then select new user. Enter in the details to create the user.
4. Expand Groups
Expand groups and then double click on Administrators Group.
5. Click Add button
Click the Add button and in the new window, type in the name of the user and press enter. Once back at the General screen under Administrators, click Apply then OK.