if you have 2 screens for open Vendetta you have activate mirror screen, and go in option video of Vendetta select windows screen, quit vendetta. turn off mirror screen. et open Vendetta you can use your 2 screens one for paly game other for work :P

See the thread labeled "Can't Launch in Full Screen"
http://www.vendetta-online.com/x/msgboard/5/7192#87185