Re-installing GW2
I don’t understand what it says, but I would guess your anti virus is blocking the download.
Might be UAC is blocking access or you need to be a local administrator on the system to run / install the program (or download the DAT file). Try starting GW2.EXE with administrator privilage (or make your user a local administrator).
BTW, this mostly an English speaking forum, so translating that error for us might get some better suggestions.
We go out in the world and take our chances
Fate is just the weight of circumstances
That’s the way that lady luck dances
Fate is just the weight of circumstances
That’s the way that lady luck dances