Reader Mark writes in with this tip for quickly changing your Windows password from the command line:
Go to the command prompt and enter:
> net user Mark p@55w0rd
If there are people near you and you don't want them to see the password you type, enter:
E.g. > net user Mark *
> Type a password for the user:
> Confirm the password:
You need to have admin access to perform this change from the command line. This is an especially handy trick if you want to change a password on an account but you've forgotten the original (going through the Control Panel can require confirmation of the old password). If you're totally locked out of Windows, you'll want to try this method for resetting your Windows password.