get into a damn account that can access and use the command prompt
now load up command prompt
type in "net user" without the quotes
you'll see a bunch of ids that are registered in the computer
type in "net user 'the damn id' 'new password'
ex. "net user administrator fuxj00"
notice that the administrator is the id and fuxj00 is the new password =)
don't include the quotes when you type...