GW in Full Screen kills monitor

So I have a friend who decided to let a friend play his GW account on her computer. She warned him that her monitor being old couldn't handle it in full screen mode. Well he ignored the warning and now GW is STUCK in full screen and it comes up black with a blue box that says "Out of Scan Range"

Is there any way to get around that?

Any help would be greatly appreciated! Thanks!
(My friend tried sony and microsoft tec support but came up empty and now she is at her wits end.)

Try starting Windows in safe mode(press F8 during boot and choose safe mode), and adjuste graphics settings.