Maxi017

Hi, I can´t install my Arma 2 PMC DLC on Steam. I downloaded teh DLC on Steam, but when i start it i get this message again and again: Programname: Datacachepreprocess.exe ............. : ............ ............. : ........... Please enter your Administration Password When I Enter my Password it asks me again and again and the DLC don´t start (when i enter my password three times, the window close and nothing other happens). What can I do?