Cant open 2nd instance of GW2

Hi i was just wondering if there was a solution for getting isboxer to open 2nd instance of guildwars, after i get logged into first char and it goes to open the 2nd one it says..... "Unable to open archive file" Guild wars is unable to access its archive file Gw2.dat" etc.etc
am i doing something wrong or can this not be corrected

[lax]

You can either make a copy of GW2, or add a Virtual File for gw2.dat. (http://isboxer.com/wiki/Virtual_File)

For Guild Wars 2, make sure you leave it set to the Non-broadcasting configuration style during the Quick Setup Wizard. (It should default to that for this game.)

Thank you very much man, it just wasnt clicking in my head on how to set the other copy of the game to the other char for bit.
thanks for responding so quickly