Open the Control Panel and select User Accounts.
‘Create an account’ will get you started: all you need to do is pick a name.
‘Change an account’ lets you choose an icon, set a password, and select an account type. Administrator gives you all the controls you would normally expect in Windows, and it’s possible to have more than one Administrator account. A ‘Limited’ account restricts or stops the user from making system changes such as installing some types of software. This doesn’t really serve much purpose for adults, though it can be handy for children.
If you opt to delete an account, you will get the option of saving all of the user’s My Documents files to another location on your computer.
To switch between different accounts, you need to click on Start and then Log Off. This is a bit confusing as you don’t actually have to log off: the menu that comes up also gives you the option to switch users. Any programs you have open will continue to run when you switch to another user, though it’s always worth saving any open files just to be on the safe side.