Sounds like she needs a little bit of FDISK action that'll remove it

Seriously though - the options include:

Take the PC to someone who can clean it up

or

Did you know that most preinstalled versions of Windows XP typically have a blank administrator password? you can logon as Administrator by pressing CTRL+ALT+DELETE twice as the 'pick your name' screen and putting Administrator in the username box. Once logged in, the world is (potentially) your oyster - lock him down to muppet mode

or

LEAVE